Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a5f1238d1c38aa…

MALICIOUS

PDF

90.3 KB Created: 2021-05-06 02:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bd6af53d2f568869df27ac24b59429ec SHA-1: 78cd595b00cad257ca538bf7f444c45f0bca8821 SHA-256: 85a5f1238d1c38aac20e7ae87fc77e0bc2e0426a9e966babc0c763eb357fdb3c
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The document body, though heavily obfuscated, suggests a lure related to a "Mcdougall diet grocery list". The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing campaigns. No scripts were extracted, but the presence of many external links points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=mcdougall+diet+grocery+list PDF link annotation
    • http://getfreecreditreport.info/zukepuzob33ibw.pdfIn PDF document text
    • https://rolarijigajegij.weebly.com/uploads/1/3/1/4/131438579/xigaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fe6fec6d5d27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fef110f79fd7.pdfIn PDF document text
    • http://rezltml.xyz/vintage_wooden_chinese_checkers_boardqryaq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_60175c608053f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5feb77099a6e6.pdfIn PDF document text
    • http://bred-enligne.com/86840455640lqabg.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/2576323.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/fizivibota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60498b851d45a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_60571bb2bcf1e.pdfIn PDF document text
    • http://rowefuzoj.mygamesonline.org/inspirational_business_success_stories.pdfIn PDF document text
    • https://xaduregenotilok.weebly.com/uploads/1/3/4/7/134711203/9b42fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_6033f616a27a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fd8e9f985006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wikukodukoja.onlinewebshop.net/xalimetaseturafofolul.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/dupunufidikenapepe.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/anti_inflammatory_diet_plan.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_2b1941e507a04844ac13feffdadbc436.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_ed0bf5ad610e4c6da6d5ea0b742198f5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 4992 bytes
SHA-256: d6de5fb626b183bb3f7adf7e996a682797aa1af4ab7fbee6b46f4ca047889b96
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 11516 bytes
SHA-256: eac31a5a9d7e0734e2239ccd5999e567d9fcbe2d05dd7a1681f7d6d697d6990c
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 16180 bytes
SHA-256: 9ec02419b796e5a33fa71cbc440792a301c31147771cc0bca5f0cd32dbb989fa
font_03_sfnt_off00014d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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