Malicious PDF — malware analysis report

Static analysis result for SHA-256 810bfbf3c0963dca…

MALICIOUS

PDF

69.7 KB Created: 2021-05-11 08:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 58cec3c6f504863b29d3fb4d8836869d SHA-1: b13e7844490e3ef53b234d562534749978538ea4 SHA-256: 810bfbf3c0963dca1083cd5ad12144558c356b9c313379d6c1965f9eb68247e4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or scripts were extracted to further detail its execution flow.

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 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://ponafet.ru/strik?utm_term=how+to+program+an+old+rca+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6051379c7d23d.pdfIn PDF document text
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/84e3bc6963f36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375200/normal_5ff7760a46c78.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/8395590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_602bf728482e9.pdfIn PDF document text
    • https://vidasukesidi.weebly.com/uploads/1/3/4/7/134731400/2268244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_6067312fb5c85.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/wizopazu_molavanitukule.pdfIn PDF document text
    • https://vedirivokezijil.weebly.com/uploads/1/3/4/1/134108565/motojumeluxol.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/5186217.pdfIn PDF document text
    • https://fapirezomamu.weebly.com/uploads/1/3/4/3/134382700/wediwezekuve_rudilaxusodavaz_pejubuponuwe_ximawupifefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6031bbd9306c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5ff6225a8dae3.pdfIn PDF document text
    • https://refamulu.weebly.com/uploads/1/3/4/8/134886446/3972fff41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428342/normal_6004dcf82edde.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/dowesitobuga/what_are_the_six_approaches_of_human_geography.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_cdb367420ca0483a98bf56f569e99765.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/beat_maker_keyboard_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/kizonigidaletezif.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/lotefatanakigakov.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_0f724bf288fa4f6880642bc8f60e6de9.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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 5268 bytes
SHA-256: e1dd7b983a72837dc69f115f400c5158dbbc1139c13eef3ae228a70768a3752f
font_01_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 9880 bytes
SHA-256: 7d8f5b1f7a5de85484f49e01b622f1dcf91f5c093ebb5cc37ec8a7831498effb