Malicious PDF — malware analysis report

Static analysis result for SHA-256 8792fed37a456594…

MALICIOUS

PDF

95.0 KB Created: 2021-05-09 22:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a830d93f5ce18043b2f73a61151bc1f2 SHA-1: da479fc3c24859b55bc183c342663bd6a1cd9e8e SHA-256: 8792fed37a456594c92be69cd43bda9bcf6d34546f3a4fc5355ce1e3d8ac5130
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=kingmaker+summon+monster+list PDF link annotation
    • http://bitawulam.iblogger.org/operations_research_analyst_salary_philippines.pdfIn PDF document text
    • http://all-system7.work/is_there_a_just_dance_2020_for_wiihls2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_605f96815c2e9.pdfIn PDF document text
    • http://fuzebopirafune.22web.org/64400565536.pdfIn PDF document text
    • http://arm-watch3.club/greek_mythology_stories_tagalogg1g03.pdfIn PDF document text
    • http://detonic-italia.website/635775836720yezh.pdfIn PDF document text
    • http://bigwin-1xbet.fun/tudufofowinigiguwepifa80j1j.pdfIn PDF document text
    • http://luranowebereni.22web.org/learn_english_to_portuguese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_6047fbda4029b.pdfIn PDF document text
    • http://stonersfranchise.com/78317352982iical.pdfIn PDF document text
    • http://usesucre.pro/955325986969iq97.pdfIn PDF document text
    • https://webojugobe.weebly.com/uploads/1/3/4/6/134601542/970964.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/dharam_adhikari_film_song.pdfIn PDF document text
    • http://help-violation.com/yamaha_v_star_1100_service_manual7rlu7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_60149b4f1e8a0.pdfIn PDF document text
    • https://zedijonen.weebly.com/uploads/1/3/4/0/134018258/4fa42ac32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe7d992f1f04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c2d0fef-d1d6-4038-bc39-4f89cae3d2d3.filesusr.com/ugd/7dd30d_2378ab48f76e4e27b47d40a4e5810eb0.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_8e010e22a8364a379615924de0de5852.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_f4c03b88b2e84bb499f0fc4096f9e39c.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_543a434291514962bc10fdd9fe2b3e19.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_8d2f261e202940f79b93c8c99c116157.pdf?index=trueIn 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_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 5036 bytes
SHA-256: 0c3b1a4476266c554327f8c4f5fc63a6ce9abcf2a03980331f55bbd6a13c05ac
font_01_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 17044 bytes
SHA-256: 7b05b1891611a603c8b8bed715beb3a11fb7164076115f5a6c16be221d4c6119

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