Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9f106111fc66ca…

MALICIOUS

PDF

109.2 KB Created: 2021-05-26 05:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c70bf7c8178b64b2db08dc7cc38ec5c SHA-1: 4970428f0ab3ca76e2a8835c28578311f1313cb0 SHA-256: 5c9f106111fc66ca7a01e86abf050cf6ca3d4407953bc8425cae2e7c8cb820ad
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, presenting lottery or prize language alongside parcel delivery requirements. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://botokaw.ru/strik?utm_term=is+a+prenuptial+agreement+legally+binding+in+the+uk
    • https://cdn-cms.f-static.net/uploads/4387035/normal_6028fe225edd2.pdf
    • https://static.s123-cdn-static.com/uploads/4445868/normal_5ff360edaae58.pdf
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/rokowelapi_monedepinid.pdf
    • https://cdn-cms.f-static.net/uploads/4374956/normal_60485f30d613f.pdf
    • https://cdn-cms.f-static.net/uploads/4489852/normal_6041d1063876c.pdf
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/7670636.pdf
    • https://cdn-cms.f-static.net/uploads/4384639/normal_60431e258266f.pdf
    • https://cdn-cms.f-static.net/uploads/4479254/normal_60236acaa5f3e.pdf
    • https://cdn-cms.f-static.net/uploads/4419849/normal_6009dbf4144fa.pdf
    • https://static.s123-cdn-static.com/uploads/4417526/normal_5ff12051444f9.pdf
    • https://cdn-cms.f-static.net/uploads/4455883/normal_600bbf60395cc.pdf
    • https://static.s123-cdn-static.com/uploads/4450641/normal_6009468f1b6a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xebuvuwov/spencerian_calligraphy_alphabet.pdf
    • https://s3.amazonaws.com/dazifozixawus/cants_689_form.pdf
    • https://s3.amazonaws.com/bokelur/bojizesagatutokajake.pdf
    • https://s3.amazonaws.com/resisuna/how_to_refill_canon_ink_cartridges_251.pdf
    • https://s3.amazonaws.com/ginutu/chanti_movie_songs_doregama.pdf
    • https://s3.amazonaws.com/bokexizometun/despicable_me_2_trailer.pdf
    • https://s3.amazonaws.com/tesasubawalozan/basic_piano_sheet_music_with_letters.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d5a.bin
6590907a8fa51f73cc3fa19fc847add330f80832249d8641e048c5559f390006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5A 5616 bytes
font_01_sfnt_off00018048.bin
6df450c7f7216f762fcbf1029693552aa1d7736b89d9171dfe03ef735d24b481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18048 11352 bytes

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