Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d9a235e993fa68…

MALICIOUS

PDF

83.8 KB Created: 2021-04-02 09:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2b6496c690c4e502c68ce68f0915af2c SHA-1: b86886f04b776f1eb94972d664a73bfa5ae059e4 SHA-256: 61d9a235e993fa68efee3c070511420a2f366884265079ee93f6c6210f14b8b9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nipisod.ru/strik?utm_term=yardman+riding+mower+owner%2527s+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415525/normal_604dc148ba0fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_6029b05f07c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450439/normal_5fe48db8430c1.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/career_paths_management_ii.pdfIn PDF document text
    • http://expressvpn.store/spider_man_ps4_game_apkpurezqmfi.pdfIn PDF document text
    • http://kozugufasuroti.mygamesonline.org/away_in_a_manger_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_60581ae75071e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372399/normal_60088fbc411b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_60314b4f38e61.pdfIn PDF document text
    • http://foodguideblog.com/scrabble_cheat_sheet_freesx4fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5fe8225b9836c.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/jevivozuvalesakelotezewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_601a99e296e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_600adf564c027.pdfIn PDF document text
    • http://fosukimiten.22web.org/97819364148.pdfIn PDF document text
    • http://devigebogubiret.getenjoyment.net/dojut.pdfIn PDF document text
    • http://tasonilevibinu.22web.org/5234576621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ff7653d5b5f4.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/airport_vocabulary_exercise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajodedepadabu.rf.gd/kinarigudabugodaligobe.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c203a6d9b36a4e2c8f3f22c9497edf05.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_407ce99f34e84e7f9d37fa6638948092.pdf?index=trueIn PDF document text
    • http://nepitamidi.epizy.com/nurumorisilofevidipivep.pdfIn PDF document text
    • http://vesunisiwu.rf.gd/davigogegibuledavaz.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_363560bec83e49809b576374ec17e7d7.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_2956c33d84ce48198113f66f1bdc3f1f.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_73b6d5b81f2b4f7e84ebf6e8ada5ff74.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 5232 bytes
SHA-256: e5c1f00840e12a410ddc945de7cef601ad218c8f9cf9d84e593cfd20e49bb1bb
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10948 bytes
SHA-256: cb8241ae6b0ca8e784213c0946d7481340bd58a3a149585dae0ad92b1d836844

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