Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca699e9492ecf55…

MALICIOUS

PDF

71.5 KB Created: 2021-02-22 19:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 47dfae5c12939de7982c13cab21a2f98 SHA-1: 2c8e605bf9e75892639231a3e82c940b25c66d98 SHA-256: aca699e9492ecf552f6e17b89b54cab5b7dc2cfb133090f6a4d3ef6a56298777
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to distribute malware or phish for credentials. The presence of external URIs suggests the document is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/wix?keyword=apk+facebook+lite+old+version PDF link annotation
    • https://cdn.sqhk.co/vedanoderifu/5bhjTgg/42341292333.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/mandated_reporter_training_quiz_answersj8u19.pdfIn PDF document text
    • http://stroiline74.ru/digitech_rp50_manual_espaolionhk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601b8b14b0d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd23ebac8902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_5fd39bf7aa288.pdfIn PDF document text
    • http://graatorama.space/new_york_city_night_day_productionacb67.pdfIn PDF document text
    • http://triple-doska3.club/zokomumugapuwewimemamurixo3c8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_600a23fb6bdba.pdfIn PDF document text
    • http://pressit.fun/40244989848vnb6k.pdfIn PDF document text
    • http://flathead.us/418055601491t7fs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabukek.rf.gd/zalisalozevut.pdfIn PDF document text
    • http://turebaso.epizy.com/71479412636.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/adobe_flash_player_update_firefox_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/valkyrie_crusade_amalgamation_guide.pdfIn PDF document text
    • http://zetulinug.rf.gd/10384926322.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/expertise_plural_form.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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 5400 bytes
SHA-256: 749178d36c1ad0c661d7c1f6c82320aaa0a07c8125b5febe380539a12277d5bc
font_01_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 12900 bytes
SHA-256: d3ffa7fb99f3138df30b275212d94001de6b30bedca95e675a15264116817702

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