Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc56a689e969d1bc…

MALICIOUS

PDF

92.3 KB Created: 2021-06-10 08:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ab893bdc6782f1d6ead60262937512b8 SHA-1: 3d6ea787a31563f620e2d50a9766916ecbd92432 SHA-256: bc56a689e969d1bc245dceef68045a33058803347d20f557e6791735cd3c392d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/pbw?utm_term=birthday+iou+template+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fcbf7c2d9217.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/kajasirib_beputodewela_fuzazupujezom_watele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_6024816a9ff23.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/vapulizixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fccdc3daf45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_603eb798d1202.pdfIn PDF document text
    • https://gimatiderimu.weebly.com/uploads/1/3/4/7/134774165/7275736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499673/normal_604363b443ef2.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/d6a26fab38fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471958/normal_5fed9d85ed7f5.pdfIn PDF document text
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/607811.pdfIn PDF document text
    • https://xikefopu.weebly.com/uploads/1/3/4/7/134748362/pojesorupubebuxurug.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/9238e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_5ff04bce2dc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_601ae506e5dc8.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/fusukapivupula_denurezu_tivazopefaz.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/wojumiwutuzutog.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
    • http://gatunam.pbworks.com/f/83331141983.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/w/file/fetch/144617943/onn_bluetooth_in_ear_headphones_instructions.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/dedufixuvex.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144722952/gopelevemarirepe.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144790059/ng-book_the_complete_guide_to_angular_9_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 5028 bytes
SHA-256: 502c4fc1f949c65364f2f4a8ef22ecbad5b978db28f3a4fbc8384435384221b2
font_01_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 11068 bytes
SHA-256: 17c20bd379690f6f8403cefbd38ce98f68eb1b3cdd3c2004b2c4215c90cb9dc2
font_02_sfnt_off0001545b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3