Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b18f5a40ef3b63…

MALICIOUS

PDF

91.0 KB Created: 2021-02-19 19:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7c422bc5fc8b80b4a8d9ed4923e3ae1a SHA-1: 87764fa51118d44db1b9de1f0fa13eb4575bbdf6 SHA-256: 82b18f5a40ef3b63d57037aad96d529ecc52035a93e9055b75ff052a750b43b9
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing or redirection attack pattern. No scripts were extracted, but the primary attack vector is the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://yafferge.ru/strik?utm_term=flashing+fl+on+duralast+jump+starter In PDF document text
    • http://nubavawitaduder.22web.org/65755186128.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/hdfAPge/15817641685.pdfIn PDF document text
    • http://lemopebese.66ghz.com/lixomiguros.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/kFT5hiD/73469109472.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/bLYgCEB/flick_goal_posts.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/Yijihb6/lesson_plan_template_high_school_science.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/gphg9AT/95336925024.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/lanorolowu/nirigibudali.pdfIn PDF document text
    • http://nipujolejorekal.epizy.com/sizumaxatarogadawepemu.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/bosch_aquatak_100_plus_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/jatugikibofofukex.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/zosewafizolujimig.pdfIn PDF document text
    • http://nafaloputazesoj.rf.gd/uniform_circular_motion_questions_and_answers.pdfIn PDF document text
    • http://rosiwik.epizy.com/mazixarinapawu.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/ribena_blackcurrant_fruit_drink_nutrition_information.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_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 5484 bytes
SHA-256: f35c3a210f362365f0031a1524af6a0fc01dfdb1b7e65a993e9bbacaef27109c
font_01_sfnt_off000136e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E0 11884 bytes
SHA-256: 0272a652ae91d13506216a45405e6382b879481c6212d44dfc6493f56c20ab87

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