Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b976e3f153730ba…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 09:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe6df58f779c80215848deded20b739d SHA-1: 185da29204559750f0d516a34daf0459283367a6 SHA-256: 8b976e3f153730ba84121b3b1b7692ecc2b0bd5e363f3b15c2236ad3a018d1d9
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=febrile+neutropenia+guidelines+2020+pdf
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5ffd0ce9e4013.pdf
    • https://kesupegujofoju.weebly.com/uploads/1/3/5/3/135388852/ca93a79471cf.pdf
    • http://koxivesuvif.mypressonline.com/29815260309.pdf
    • http://gosejoligezo.iblogger.org/bhagavad_gita_telugu.pdf
    • https://cdn-cms.f-static.net/uploads/4380079/normal_603bdfc1685d9.pdf
    • http://lumogodasekepi.mypressonline.com/57995713182.pdf
    • http://surevixa.22web.org/kanijeleralan.pdf
    • http://wamimexololiwam.iblogger.org/dyson_ball_animal_2_upright_vacuum_for_pet_hair.pdf
    • http://fejavodexata.getenjoyment.net/sizilesebataxofasezokox.pdf
    • http://rubewox.sportsontheweb.net/boranugusepilarezebaj.pdf
    • https://cdn.sqhk.co/zapusukajev/djfgebc/kaxun.pdf
    • https://cdn.sqhk.co/sofopiro/2iUiioA/international_day_today_calendar.pdf
    • https://cdn.sqhk.co/lekusovu/bDC8NG0/smog_ok_stickers_meaning.pdf
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/1088099.pdf
    • https://cdn.sqhk.co/bifoligi/jczCgge/best_baby_sleep_sounds_app_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5ffd3f8c95553.pdf
    • http://nusowutevu.getenjoyment.net/43916261395.pdf
    • https://cdn.sqhk.co/fovudadeweto/hcHFjfV/15165399360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bomigezi.epizy.com/zaxumux.pdf
    • http://xefiposokupama.myartsonline.com/3501794793.pdf
    • http://nabunuwo.epizy.com/doraemon_drawing_video_song.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_off0000f49d.bin
cc15c580e779395607be7ad99ab4619bd4e155a97911cc4dbd75220204e8849e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 5576 bytes
font_01_sfnt_off0001079b.bin
887af05854e84a5a2f1e0b8ab9120ce564b8c989ae1af0af64e1cda3f28b0823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10744 bytes

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