Malicious PDF — malware analysis report

Static analysis result for SHA-256 017a87328435b47d…

MALICIOUS

PDF

76.7 KB Created: 2021-05-21 18:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 85a95886566b8300e3f74de7fa082f18 SHA-1: efad15051d033f9c3e3ddefe1e72ba7b973715bb SHA-256: 017a87328435b47d41bf769bf83ead85e206619da12665ffc6b98381d82f67c6
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+does+a+variable+vane+pump+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448735/normal_606e325ca843f.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/mumefuxuze.pdfIn PDF document text
    • https://gebifulud.weebly.com/uploads/1/3/0/7/130775692/1826345.pdfIn PDF document text
    • https://pupinalakarer.weebly.com/uploads/1/3/4/2/134234580/xugeroropumadajevuk.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/9943358.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/3512306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_5fd8e5ed751d4.pdfIn PDF document text
    • https://gojajegu.weebly.com/uploads/1/3/6/0/136050346/kaxuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418199/normal_5ffdcbfd34be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_6022effe7cfe7.pdfIn PDF document text
    • https://metidelesaweso.weebly.com/uploads/1/3/0/8/130813592/6966646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fdb7f67d9eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5ff88e40e75eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b250077a-ff7f-4acc-ad70-cefbfcbf8aa0/40755375033.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/nikon_speedlight_sb-800_vs_sb-700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33628d9e-24ca-4324-9ac6-91f2dccf34bb/niledume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d2b8d0-885e-451d-8ba1-8c889202aafe/lulosokupewegariz.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/33668070431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc0e953-e7a5-4244-b37d-c22cf9895024/les_miserables_2012_gavroche_song_lyrics.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5420 bytes
SHA-256: 507e3807db99b318b3568ae2e865d4fcee5c59d81479decdff8109831edafc48
font_01_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 10820 bytes
SHA-256: 25219f54940b8c13015ea7e9d13e383c979f0cfabe7dcf364cd8a12ae1f1549e