Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3673cb1709a6a14…

MALICIOUS

PDF

84.3 KB Created: 2021-04-24 05:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8c9ebedd0bcd14ac4d295533e6b2810d SHA-1: 47f28df851e3d18f3d2ede99db25f13a6f3859b4 SHA-256: f3673cb1709a6a142292e3f60f5a2479f230628587af641370928cd1a2c66662
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body, though heavily obfuscated, contains text related to a search query, further supporting a lure-based attack pattern.

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://fokemale.ru/strik?utm_term=how+to+say+i+like+to+eat+pizza+in+spanish PDF link annotation
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/podibetuw.pdfIn PDF document text
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/xamonan_gupanisizazopi.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/lisomid.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/xtgdCah/50722002969.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/Liewpxm/baxiwotizuzezezarawiji.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/272bec6798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_60368c4095f0a.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/0TMleum/51088481785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_603f5f459dfee.pdfIn PDF document text
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/9352490.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/icXogfY/58020876033.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/jf3Pxje/guxasijuwubizusape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_605c976040eb8.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/c46c76884f.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/0ce377cc9d4bd.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/CihhdCE/balotewurut.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/fig0geQ/63142922594.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/wemupajese/internal_audit_salary_guide_london.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/7150720089.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/54575850716.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_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 3744 bytes
SHA-256: a9bb0890e9d3dc23b62909607f357cb94bca21e34e985f5734a39d4aaab6a62c
font_01_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 5080 bytes
SHA-256: 6dca1549dd4dac8d1c8a276fc3d6b8996443847a57c3d512c08bd24734fd6c4b
font_02_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 12200 bytes
SHA-256: 03a5088d9781731734b51e8a2309b781165a35cad6e008dffecfc3052e418b09