Malicious PDF — malware analysis report

Static analysis result for SHA-256 1362c43145374ada…

MALICIOUS

PDF

112.4 KB Created: 2021-04-02 22:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1b25bd9b2cdca64204541ca6798a36d8 SHA-1: 20fcfa04abec599c64657145996765fb710bec3e SHA-256: 1362c43145374ada9ff50dd0f073c1459249c8613e25b63d88733a4fb414f51a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or distributing unwanted content. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to lure users to malicious or SEO-abused sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=catholic+bible+in+arabic+pdf PDF link annotation
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/3181fc.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/jo8gi01/skater_jeans_90s_mens.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/bumazuseme-zarunibuwogaba-lozujog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6058ef14c6e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_603b48cccc97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_6044728a9e1c5.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/SEifFgg/11782148009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6013b1688fb22.pdfIn PDF document text
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/d78afc67.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/iEqgiib/zika_virus_symptoms_in_babies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fe230f9a90c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/f2aL2hd/easy_fried_cod_fish_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/easy_classical_piano_pieces.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_3ad37c17264c4d80b3cd9d05cdda2e9c.pdf?index=trueIn PDF document text
    • http://serekosesera.rf.gd/ansi_c80_1.pdfIn PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_7029769bd35c422eb753e8b0723cf3e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/best_autocad_viewer_for_mac.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/51807720122.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_bf92d86a73e04245b823c86caaf9c293.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/australia_awards_referee_report_template.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_off000180c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x180C7 28888 bytes
SHA-256: 36eccbd87f374b46803486ff7d7d19afe84d1f7a8dcdab5b6820ccd14eccf559
font_00_sfnt_off00014043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 5112 bytes
SHA-256: 217947635f38ddd44d9326a7c310a72edc1d3a1112a2fc8159d03ae93311dff0
font_01_sfnt_off00015193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15193 14592 bytes
SHA-256: b9626741429063e6f0b61da37847f1b6d37fe22283c032d063d316eb7127c33b