Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d3304d2675737e…

MALICIOUS

PDF

86.1 KB Created: 2021-03-22 16:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ba84f85f9a0f01911ba64376f1300ce SHA-1: bbd33a1cb50aaeffc264a69df0c80178562c0fea SHA-256: 39d3304d2675737e74fabd6888ab440c01b78ca2e45e5925c8e927398fc3eec5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of many external links suggests the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=city+of+modesto+business+license+search
    • https://cdn.sqhk.co/perokokamosa/2hfnfem/devozukonalojuniwe.pdf
    • http://arboozfilm.com/75604519841wkhmn.pdf
    • https://static.s123-cdn-static.com/uploads/4462368/normal_5fcaa0266c0e4.pdf
    • https://static.s123-cdn-static.com/uploads/4386366/normal_5fe33149449c2.pdf
    • http://mignonette.space/631371993240hadg.pdf
    • https://cdn.sqhk.co/nidaruzada/nBOyu5D/camscanner_pro_apk_crack.pdf
    • https://cdn-cms.f-static.net/uploads/4471959/normal_60171a67ce485.pdf
    • http://kihepc.xyz/63366109671j7238.pdf
    • https://static.s123-cdn-static.com/uploads/4373297/normal_5fe45014433ba.pdf
    • http://srakan.space/sokabigiwafutazizevfxpp9.pdf
    • http://idealica-italiaofficial.site/zuma_revenge_free_download_full_verskzfur.pdf
    • https://cdn.sqhk.co/virurewev/ehjghfp/99952479790.pdf
    • http://fiwisud.getenjoyment.net/68603631312.pdf
    • http://greatmasters.biz/microscope_quiz_answer_keyciwom.pdf
    • https://static.s123-cdn-static.com/uploads/4462993/normal_6007c7c6509bb.pdf
    • http://0fruits.space/hotmail_hesap_almaggewe.pdf
    • https://cdn.sqhk.co/zoxinugokas/c7ifFic/valunogorodejalozewowobi.pdf
    • http://radogomi.mygamesonline.org/bekopozaraviwelonaxuri.pdf
    • https://cdn.sqhk.co/bomumuxa/72mhigP/real_followers_for_instagram_likes_for_instagram.pdf
    • http://ionatr.fun/alamo_colleges_staff_pay_scale_2018axtky.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_ca272951b2a14f329d64405da072f4d8.pdf?index=true
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_8e8b2098f2dc4524aba6bee34cd658ca.pdf?index=true
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_6c28675805fc4acebe949ae2a5967f8c.pdf?index=true
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_340512f26b284d36b9b4d7f05e6989d9.pdf?index=true
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_4bf44fd0f61f47168b08d780d6118178.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ff.bin
b7f5c57d75b6629a726b70334f6c02fd2f2ffc8901e10d2cda09168cb3aaeae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 5408 bytes
font_01_sfnt_off0001163b.bin
b5c91d1d4cbd187f5556ef4dbe42c98d54b27980106359245f76123c07da0060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 10728 bytes
font_02_sfnt_off00013aaf.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 4324 bytes

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