Malicious PDF — malware analysis report

Static analysis result for SHA-256 816b75f82dfa1555…

MALICIOUS

PDF

71.4 KB Created: 2021-01-04 23:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75937516b5facb5a30daff81c4adc549 SHA-1: 7af6c046c36c4e8a5c85f1d015803ccf48801c97 SHA-256: 816b75f82dfa1555cbe697aa13da3460f0dca671ae176caac92900ab725998b5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://traffset.ru/123?utm_term=but+that%2527s+just+good+teaching
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/5fe8a.pdf
    • https://cdn.sqhk.co/fevivesuxofo/UPVvmcn/marketplace_phone_number.pdf
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fa4130311303.pdf
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/7401879.pdf
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/9496575.pdf
    • https://cdn.sqhk.co/kesufetumo/CigtMhf/magician_saga_mod_apk_1._1_7.pdf
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/9877e404060b45.pdf
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/7947086.pdf
    • https://cdn.sqhk.co/lewulula/caieiiv/ravensburger_puzzle_store_near_me.pdf
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/gurelutujerun.pdf
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/8a232.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sajezife/4148184504.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe6.bin
39b2814dc7846f08102d308fed48df246a9ff4c0870da601eac7445ba6a66457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 5232 bytes
font_01_sfnt_off0000edc2.bin
af862049b25bb319c4878a4c76f2c6170100a5eab3217e3e0ae562fad66c2c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 10196 bytes

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