Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab5ab44a93bfcde…

MALICIOUS

PDF

163.8 KB Created: 2021-04-08 00:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7fe0bfdf41c36e5edbec63be73357873 SHA-1: 59dd324b837c235c9e66584822ccf938fd51a4ae SHA-256: dab5ab44a93bfcde4c9f4d45953fa0c5b694c48d1ba210eae57a540c9c32326d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous external links, including one to `druttle.ru`, which is likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to test answers, aiming to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=holt+mcdougal+biology+chapter+4+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451033/normal_601afcabc1c48.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/1192832.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/catalogo_mary_kay_maio_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417653/normal_6068259e4ae83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5feb1f5cb71ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_600d26fb680f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_60260d822b067.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/handbook_of_livestock_management.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fe021e3e03b0.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/29770768106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_606c271040f0d.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/1984_study_guide_answers_part_2.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/8d22a5233.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/22533887468.pdfIn PDF document text
    • https://xesirizibolaz.weebly.com/uploads/1/3/4/4/134432563/dbb660a22.pdfIn PDF document text
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/tamatixavekizurotigo.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/popsicle_stick_house_plans.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://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_1fe5b5fa2cfb49dd8ca2e81f0908e686.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_b08d9e70005c44b7af448884f58c525d.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_931bfd42a11a43738123a18185bb33ef.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_7e0f5a96032844ee93ac2518378e1f8f.pdf?index=trueIn PDF document text
    • http://fataragoreb.myartsonline.com/vexetakiwuwabuminubal.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_18db33921f0b4953965abd8deeefe48e.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_off000237ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237AB 5752 bytes
SHA-256: 25349ef8d3e24cbf118b497235550c31f321ebb9f25fe8d5c51e0cf190a8ccc4
font_01_sfnt_off00024b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B2B 11636 bytes
SHA-256: e06b82055b88fe2d1f4c8e084f2d1385c1c9de1719a6714939de1bb36ea3690f
font_02_sfnt_off0002728b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2728B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361