Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5ba5401fbace0d…

MALICIOUS

PDF

70.4 KB Created: 2021-02-21 05:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 83392ee137c2646cb18407ae90748f89 SHA-1: 20e2c4ed23baab82c45fa4e7c21496cebefa1f04 SHA-256: 8a5ba5401fbace0d760762b72d87b26b1975d8fdea6beceecb5c580cd8929395
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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=brevard+clerk+of+courts+beca PDF link annotation
    • http://zupebupinumupo.iblogger.org/uber_dangerous_driving_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_6026ec4accc2d.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/ca36a12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5ff4490fbdf47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff64a8790ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_6020facfe9e39.pdfIn PDF document text
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/5adccaf7f26c38.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/8856779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fddf4f4967c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5fffb9a15304e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_601c79b41638c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5ff409992400c.pdfIn PDF document text
    • http://kizexibos.iblogger.org/aurum_blade_unlimited_stats_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_600c21689e362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_602550ff9ce8c.pdfIn PDF document text
    • https://gawotajar.weebly.com/uploads/1/3/4/5/134525297/voxifotul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6023a4d50a3d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fca6e54f2cb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvojidepezepag.epizy.com/biology_textbook_class_12th.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/nomefogodavatojubikod.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/couper_un_fichier_mac.pdfIn PDF document text
    • http://rafodize.rf.gd/bm_convert.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 5328 bytes
SHA-256: 7244e9af4b40a49851a5ca544f60f51dc7f6d88eafc1a4cf8b03e377b3eb1667
font_01_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 10776 bytes
SHA-256: 37a12d46b1a7355a9bc9503bc160627a343b8c525846af74526c0556948e99c1