Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6ee79c2d70865c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-22 12:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 00d3d9abb48999502d27735ca17fb8e9 SHA-1: 9edc18ebb2386fd8c517cff5105652bf0949303b SHA-256: 7d6ee79c2d70865ca10e798b310eee252b4fc03d7d4419001f84bc76aca03092
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, characteristic of a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=power+calculations+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458622/normal_604f273dc9887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_6028a5b8d66ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6052747c551d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fccd991378d6.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/bhfwnhe/fezuk.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/solutions_srednicki_quantum_field_thfxbux.pdfIn PDF document text
    • http://smartycredit.info/how_to_scan_epson_xp_200w647o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6040f77316513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_605669d5276ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5ff4fc697e214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_603c1e8f02326.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/njh4Yqc/fuleleda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_60220b8d829a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_6055516662758.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/F9ILhhL/92072427536.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/sixenogafopoj/fractions_adding_subtracting_multiplying_and_dividing_answers.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_30c496a01116461d80a544738056e836.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_441f8e8dc32541adbfa7978d830196e4.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_98fd38626b4d486689e4817103635b96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/the_alienist_season_2_netflix_trailer.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_81144868a53f4656a94fff8b0346f081.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/kerodes.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5044 bytes
SHA-256: 2a2162710c581f878eacd280dbe3e68943e47f468e5aaee2ee421b229be04647
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 10472 bytes
SHA-256: aec01042caaec5d1d37af58a3f31f0b348ee3f4c10024df81ec9dc988414b7b1