Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e0353e7cd6de04…

MALICIOUS

PDF

72.5 KB Created: 2021-03-01 19:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45bc8489fff24311297c0b323956f0e8 SHA-1: 7e933544566881ad2cf6494c7745c6a724615b4e SHA-256: f4e0353e7cd6de044207337001d658a1d1464250973b840293f942bdae31b94e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/award?keyword=seeds+of+solidarity+garlic PDF link annotation
    • https://wivojusifapuju.weebly.com/uploads/1/3/5/3/135327063/welixofu-fugezujamarozob.pdfIn PDF document text
    • https://fojigexo.weebly.com/uploads/1/3/4/2/134235048/kawisebizor_supewefuzajew.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/eDUgfjg/cool_skins_minecraft_pe.pdfIn PDF document text
    • http://bonus332.site/59103164641bh8n2.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/hhhieOH/deer_hunter_classic_mod_ios.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/61231944387.pdfIn PDF document text
    • https://degitetebumike.weebly.com/uploads/1/3/1/8/131857056/wumawepeligoranaso.pdfIn PDF document text
    • http://teksalon.xyz/44836503058i3olt.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/hegjhih/99307540608.pdfIn PDF document text
    • http://afracheat6.xyz/8003368533828qb7.pdfIn PDF document text
    • http://wildboost.club/bees_saal_baad_movie_1988rfw5k.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/mibuwuziwof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/let_it_be_piano_cover_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/weather_report_greenville_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/pufivomixolotonofofemomeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/thanksgiving_cryptogram_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/winrar_for_mac_10._7._5.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/cabal_pilipinas_free.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/nike_brand_identity_guidelines.pdfIn 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 5392 bytes
SHA-256: 2c854f11b4b33651352621ad590bb010c7931e02a1411e79be252daad323f148
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 10568 bytes
SHA-256: a2148f7f91337ebe1eba5219a36011c572b5dac71b63bd418006d284998a2f9c

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