Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a730ef41f9aca0…

MALICIOUS

PDF

73.3 KB Created: 2021-01-17 03:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8e36050c2069100b2f7980cffee21ce4 SHA-1: 73418dcfb87ec11e8f56e03ac6f067279f2a88de SHA-256: f3a730ef41f9aca077b4b04f3d26eff8057fb6276bc5b5dbecb89adb5216fd9a
304 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates a credential phishing lure impersonating Microsoft, directing users to a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern is credential phishing via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/dd7f1d2a.pdf.
  • 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.
  • 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://gettraff.ru/123?utm_term=how+to+remove+okcupid+account In PDF document text
    • https://cdn.sqhk.co/tumupowe/nnhhhbm/pitelujevotixerub.pdfIn PDF document text
    • https://site-1084296.mozfiles.com/files/1084296/fevisoxekitujimoludosa.pdfIn PDF document text
    • https://site-1174122.mozfiles.com/files/1174122/7655939225.pdfIn PDF document text
    • https://site-1176088.mozfiles.com/files/1176088/74517241835.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/yifCogd/fishing_hook_knot_tying_tool.pdfIn PDF document text
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/dd7f1d2a.pdfIn PDF document text
    • https://site-1173285.mozfiles.com/files/1173285/armello_wiki_rot.pdfIn PDF document text
    • https://site-1174461.mozfiles.com/files/1174461/29966429500.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/zombie_drift_war_and_racing_games.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/zukedofonebomix-perezasaxor.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/F9ZCifr/nabilesexisazalawofiripir.pdfIn PDF document text
    • https://site-1208026.mozfiles.com/files/1208026/best_free_anonymous_texting_app_for_iphone.pdfIn PDF document text
    • https://site-1168096.mozfiles.com/files/1168096/download_game_the_blockheads_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pofilese/iGRKijj/81031810921.pdfIn PDF document text
    • https://site-1172650.mozfiles.com/files/1172650/50645238972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 5184 bytes
SHA-256: 713993971675f818767572a02c6a132d4e3e26f971338d0a38e8ec7b4f983639
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 10708 bytes
SHA-256: 94760f71174b15ab81cd549df44083c5f931075c23f9baa0bee6aeccfc860d53

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