Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b188b6e64060e7c…

MALICIOUS

PDF

79.7 KB Created: 2021-04-03 20:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03cc7ffb1c4afcc7fae47d356e6f3d1c SHA-1: 891e709fe584e6e410a6a92c538bfcd5af382684 SHA-256: 1b188b6e64060e7c98670c93caa92ec96d0cbe6c41fa3895002c51cdd5cc423a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=hoa+sen+group PDF link annotation
    • https://cdn.sqhk.co/lodesejidi/P53Izhe/infamous_game_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/OPnmjjb/29874663161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60074c955e73a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_6013810720b81.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/HTjeuhh/gozubifubegevox.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/ifYicjj/fekasoxamev.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/rational_fasting_challenge_elliott_hulse.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/aurangabad_news_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/Whe3AFO/nature_wallpaper_iphone.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/80423013696.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://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_f0a3847fef8c48bd8cc6372250fb4a71.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_58d85887f0d74fcda89c4fe17e58ff48.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_08bad48a8e5e4655ac2c011dc2ac8ce1.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_1d1b56293cd844dd8c5533106f65844e.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_21e0a6ce09504e44b2e12675cbbb251c.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_9b9a90c7ca444b6db44e9b8eab7a9c19.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_ec92905ad2654a29ba6949ae25067d2a.pdf?index=trueIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_299fde374a95418c99afd7a8f26fb07f.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_cbf30221a65d4212b8a4f376238cd35e.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_ad60e451e35a44d6a4eb5e85ab268e8f.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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 4672 bytes
SHA-256: 08aa61ca3b5b7afc5530e1073cc59810d1631a39fcc0d94bc695a82a07287fcc
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 22440 bytes
SHA-256: 1ab8784d9c25236cb0aca2a7b2ac664d26b64a417cd1a717cc4edd95d15be3a2
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f