Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffac9d3503b260cf…

MALICIOUS

PDF

72.9 KB Created: 2021-02-20 06:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1992fd0d3f9865c6ea3e5ced0cdb441e SHA-1: 085da07aee1ffca83a650530717a6d5573390529 SHA-256: ffac9d3503b260cf5be9db4544ba5338c54f718f9ec64367fe31256bbe45fe6c
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of many links on disposable hosting further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=subaru+outback+h6+oil+capacity In PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/4072765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fda2f2f7d039.pdfIn PDF document text
    • https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/d4ab3aaaa.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/B6hcRhj/radio_disney_watch_listen_live.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/kuvogowajuj.pdfIn PDF document text
    • http://jusolul.22web.org/liluwofopowogugovudopoxej.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/rotubozizoxepo_divaw_zibazi.pdfIn PDF document text
    • http://djami.ru/topagi3fwxq.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/giaic8b/simple_tiny_small_eq_kb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fca6c7596f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_601a71bf1456f.pdfIn PDF document text
    • http://artyom.guru/56212340098odznh.pdfIn PDF document text
    • https://cdn.sqhk.co/fokapalo/Hiaujd6/74531940976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fc5841ec85c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guziruxasa.epizy.com/dudufazedalakasamakikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/gps_garmin_gpsmap_60csx_software.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/word_for_answering_your_own_question.pdfIn PDF document text
    • http://dagilupakov.rf.gd/balance_sheet_assets_liabilities_and_capital.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/voice_call_app.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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 5408 bytes
SHA-256: 0acccae451c39395eea66f1acd8b0a262e030cd752a8771207c62557e4460c17
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 12020 bytes
SHA-256: 9ac741d7de677cd3edb8ceaf9da49880588d8f87500bd47f73f306bdd0194990

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