Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9ffd124a48d7c9…

MALICIOUS

PDF

72.6 KB Created: 2021-03-22 06:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc1f269eaa8876c4e484f0334930f652 SHA-1: 4e5da2b8562b0d8e3ef32f39a173cd869c9e2b10 SHA-256: 4c9ffd124a48d7c918aa91bb2e0ba60176e64ac8490513013ee7409a1943a9f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though truncated, includes keywords related to 'Tenncare medicaid provider manual', likely a lure to attract victims.

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://dugedepap.ru/wix?keyword=tenncare+medicaid+provider+manual PDF link annotation
    • https://pobokeriwefugo.weebly.com/uploads/1/3/5/3/135395193/wukekikijuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_6030cd88be19b.pdfIn PDF document text
    • http://rafale.store/bluebeam_revu_2019_free3dk2d.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/2c5c636b.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/mowexufab.pdfIn PDF document text
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/3791644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_6004526fa0425.pdfIn PDF document text
    • http://kraftmann.su/10450952906tdl9t.pdfIn PDF document text
    • http://migasoloraluxuj.scienceontheweb.net/dowry_prohibition_act_1961_in_tamil.pdfIn PDF document text
    • http://fazurusitu.getenjoyment.net/73128487216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_60361293193c0.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
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6811eeec2b8946a9b8084cc2fe4e7ac8.pdf?index=trueIn PDF document text
    • http://kivozusemu.atwebpages.com/49811375183.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_2422dec869d14dd7b9f8e82a5124daaa.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_76f348a6bd104844ae0b138060563988.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_5c536bdc051d4e30a4683ffcfa9618cf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 4852 bytes
SHA-256: b3113bbbfd346b9dcee772c09c3a0ab997e056fd9ba8e0aa87d78b88dd816dbb
font_01_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 10948 bytes
SHA-256: daf967fb628e996c1f8d7a1aa5ec72f1439d7e1285ce2cd9faa8f996e39b8cf5
font_02_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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