Malicious PDF — malware analysis report

Static analysis result for SHA-256 a460a55cb9ef7a8e…

MALICIOUS

PDF

76.1 KB Created: 2021-04-02 14:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9bb322fcd0987253f3f53dc8455f54e0 SHA-1: d708f51b67b3cc2ebbdb83fd437c0a893be5f63a SHA-256: a460a55cb9ef7a8eeeabb5b56ee8bd91e824f74af96e5b8e5dd4513d5edbd9e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though truncated, indicates a lure related to applying a decal, which is likely a pretext to mask the malicious intent of directing users to external sites.

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
  • 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://kuzutuzo.ru/strik?utm_term=how+to+apply+a+rear+window+decal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381766/normal_6021859eaf8f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_60165c0a4fc36.pdfIn PDF document text
    • http://fiwogozugoxiget.22web.org/medical_fitness_certificate_format_for_bank.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/luridoxokexiwas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5fe5ec02b4190.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/bezukabiwopov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_6001fa0972cc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovemipenege.rf.gd/mutewokine.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/12661650245.pdfIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_9b50180ba4ea40a2b23a7d82962c3b57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/16440482163.pdfIn PDF document text
    • http://joduzot.rf.gd/94941774555.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_969121263ec1413eac77d7bf7b0a60ef.pdf?index=trueIn PDF document text
    • http://wiwosotu.myartsonline.com/aktu_b_pharm_syllabus_2020.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_ca995d30080942819f5f82a6e2c2de3c.pdf?index=trueIn PDF document text
    • http://dirivegejapa.rf.gd/pozerinorowixijuwe.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_f0c288755ea74874bc416fdd257bb6e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povodijirig/zudenakoguravufer.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_451055ef02b84079b689e6d42d50982f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/puvozokitexo.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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 5044 bytes
SHA-256: 88e67e0101d6b8158b85ec70df257b248225148bacc7ed5d6aab41e619519455
font_01_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10932 bytes
SHA-256: f85e35d6715523e09baed2fe87196ae065ac144c6b538a79d4b9575473881b60

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