Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3fa0e4c75629b2…

MALICIOUS

PDF

160.8 KB Created: 2021-03-08 14:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fd1ff1a306b6dcefc5743c1b11d45aa1 SHA-1: 0323337c9a0050477826852b94e7fdf31d9b97b5 SHA-256: 8b3fa0e4c75629b2c1e5c70c67deb457ce41c79155e4607663a8cabeab8a6273
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://golowaki.ru/123?utm_term=burford+rustic+book+black+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459777/normal_6037543d048d4.pdfIn PDF document text
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/xamir-gujix-zetituzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_600e41a92d2e2.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/9ijtPhj/48863930531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_5ff1de4f2afd7.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/YigP9jg/75023601368.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/QidnRgh/icontrolav_2012_android.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/xuvifefusuvoxap.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/gch92ib/77771964904.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/Igi5Bie/27343804583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_602785aa1f4b6.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/Vghhcje/paint_mix_with_water_and_egg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ff96db6c5369.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/1jfaEiM/ping_pong_master_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/ighgtqu/46833028521.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/vetinisimovabaditig.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/bStPHia/pathogenesis_of_atherosclerosis_amboss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_11c3d540f2fb4cb5a69df18904ede196.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_71bec9f076b84aa5ae966ab4742e8f6b.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_4a26aa30b62a4c33a9e384b35a505eb4.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_55adee1920934f2e9eea527612e87705.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_845cd4f7737c456abfbb01320238e51d.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_a9a12c4571624ddfb5230ac9619652ef.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_079b814d17d24a07a4bf41a542a7900d.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_bd1bcd92323a427e8063cb5a95b34b2e.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_02d312e0237540069c62c651e7a76849.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000241a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x241A1 28492 bytes
SHA-256: d8fae1f51113f451871f236f1d99f8b64d67693cd812395686d3121d36b795d1
font_00_sfnt_off00020610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20610 5268 bytes
SHA-256: 353c50d705e4f3e78f8606a4788b39d4cf559c48d04687e59414dfd16cb0f675
font_01_sfnt_off00021810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21810 12076 bytes
SHA-256: 47d572c382dba0654c325998c4895b93ac0f65a102f8b9613709fbeb13051b39

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