Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f42f525f5b5dd00…

MALICIOUS

PDF

87.9 KB Created: 2021-06-01 19:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 08e3d2db708014bb5a9e9b9d36b242dc SHA-1: 79d5f481837bf6952a39387ee6a8f0d5859ea764 SHA-256: 9f42f525f5b5dd009e9c06fa3d6e7395689725d7a41da382d9ebeaecf4f6835d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded document body, though heavily obfuscated, contains references to 'Brocade fabric os administration guide 7.4 2', which may be a pretext to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/pbw?utm_term=brocade+fabric+os+administration+guide+7.4+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449627/normal_600eb36362132.pdfIn PDF document text
    • https://pilazelade.weebly.com/uploads/1/3/5/3/135397465/2117833.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/4745096.pdfIn PDF document text
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/5033258.pdfIn PDF document text
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/3050121.pdfIn PDF document text
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/fonabiwalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff8fd21a0704.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/kagag_kuluro.pdfIn PDF document text
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/1680933.pdfIn PDF document text
    • https://lajutowip.weebly.com/uploads/1/3/7/5/137512408/rozaxadufina_lasapi_werulowe_tepotir.pdfIn PDF document text
    • https://sugevemaketajes.weebly.com/uploads/1/3/4/8/134873201/xosap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5fe22658bc3cb.pdfIn PDF document text
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/nevok_xasolodilufe.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/mogazalalok_waras_taduzokezizofot.pdfIn PDF document text
    • https://zupitexugavasol.weebly.com/uploads/1/3/0/9/130969618/936777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fa6d27-955a-46b5-b49d-519a3aed482d/playing_to_win_how_strategy_really_works_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607cb4c4-f2ef-4d01-bd93-41a0d0492bc9/ratuseterivetujimiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153f098b-55cb-407d-9116-c3ad55bbdbf1/kukajepojovapifegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4788fa-0209-43d2-9cf7-a2ca035ad05a/hardest_math_puzzles_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20e3808-6cee-4ba9-9a54-cb6a99b803b7/how_much_to_install_a_20kw_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce91ca77-fec4-42d2-a162-b4cce65c43c0/nokekesobezusobodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ebb6df8-ddf6-485a-a59d-46ceb13efa9f/vikings_at_war_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4adbbf-e576-47a5-bc59-a3af8037bf3b/16820242628.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5828 bytes
SHA-256: e3f8ca9c35045b43e5f1f67acd6b7008c73e756c1d432032cca257b545053fed
font_02_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 5396 bytes
SHA-256: e4dc8de506a35645a0378ee8180c1ecd54e6a830e66304af6df6312bdab955e4
font_03_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 10728 bytes
SHA-256: ec81a1d1505ddbcab0324e535cf66ad4fd31f171316fbc4035bd61089ec0a3f3
font_04_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 16612 bytes
SHA-256: 4d8e30ec0f1de3eb46a5a5c603bce05602743bb5f45cb804db84e2b5afee4716

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