Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e759c7ba0002a9…

MALICIOUS

PDF

92.0 KB Created: 2021-05-29 19:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f262645c11f901d179cca7952964ad8e SHA-1: cfbd9e37f390843ac5bbfbd512cd031bade7be8c SHA-256: 13e759c7ba0002a9baad83e724c03edc6f820dd110bece023155c97f657979a0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external links to other PDFs hosted on various domains, some of which are flagged as disposable. This technique is often used to obscure malicious content or for SEO manipulation. The presence of a 'Password-protected archive lure' heuristic suggests that the linked content may require a password, a common tactic to bypass gateway security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/strik?utm_term=digital+systems+fundamentals+floyd+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471252/normal_601d71dca7a0a.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/458a5bbaa261587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_605a7c5cabcfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_606e47deb4f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_603d2906d2b2a.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/00d227f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_60303d755bcc7.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/6681379.pdfIn PDF document text
    • https://todukikezigegu.weebly.com/uploads/1/3/4/3/134359798/nowev-begab-wapejisi.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/2780591.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/6eede643.pdfIn PDF document text
    • https://sugogovofel.weebly.com/uploads/1/3/1/0/131069978/kasuwikikimujevupe.pdfIn PDF document text
    • https://punerumoluzes.weebly.com/uploads/1/3/4/8/134897399/597e12.pdfIn PDF document text
    • https://dusemupewujem.weebly.com/uploads/1/3/7/5/137505742/7243053.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/f4874973-a0ad-44e8-b97f-d729109a5635/how_do_i_make_a_bitmoji_classroom_for_canvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42bcdb5f-5a3a-4e73-b1fc-00716154c1ed/gunetelara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39399d0d-090f-45d2-8d35-24a5d15774ad/crossword_puzzles_maker_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f20738-a9df-4b67-94bd-c5dc07aa0af9/zofivolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2ba008-961b-4e02-8de5-f327fe6004e6/bawewusipufasopifite.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000140a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x140A0 20388 bytes
SHA-256: 86ad740db125ad2502731e6882acc34f3c1932e484415d768a719a47dc7d8158
font_00_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 5364 bytes
SHA-256: 835e51aa07fc386bdcd418dd61bbb3085d071d41fc010ab5cc05efd2186feded
font_01_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 11628 bytes
SHA-256: a5869096d0b5ff0a667f692090c3227c96af55c3406d6352d4b851188cf8658b

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