Malicious PDF — malware analysis report

Static analysis result for SHA-256 595c1ad5cc1e0b87…

MALICIOUS

PDF

69.4 KB Created: 2021-02-16 22:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c977380cd88e224ce6d269c82ab977c2 SHA-1: 64fd9ace179400b8dc771ca1374d258992935709 SHA-256: 595c1ad5cc1e0b872f7f195998ddf8acbd41b9983e1500fc512d50cb03418651
146 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'Collin county arrest records free', directing users to a link farm designed to host further malicious content. The presence of multiple disposable domains and link farms indicates a phishing or scam operation.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=collin+county+arrest+records+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fde4e30e032d.pdfIn PDF document text
    • http://risurevisawibe.iblogger.org/31028692706.pdfIn PDF document text
    • http://feyakast.online/957274124051ly8s.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/U3DI7hg/steam_download_mac_among_us.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5fd35828d5e51.pdfIn PDF document text
    • http://fabermanufacture.ru/72677071764x87yf.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/bhfIGWZ/39588699948.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/id8Kije/flexeril_overdose_wikem.pdfIn PDF document text
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/zopapofepurexuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_60291c39501e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fe7c37543ee0.pdfIn PDF document text
    • http://autoport76.online/idsa_guidelines_community_acquired_pneumonia_201993r9u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5feeb9f1d5689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merapuw.epizy.com/dietary_guidelines_meaning_in_telugu.pdfIn PDF document text
    • http://kipamorilezux.epizy.com/30189108872.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_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 5020 bytes
SHA-256: 6e7cc6462a05ccb5b7c2d5df671365a3081a905fda5c0bfbe879a8df9f51130f
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 12548 bytes
SHA-256: 767de601c037a3d9da0cb864648335d5cc8b214f7dc96725f867b0f591b04606

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