Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca7d72e09ab93b2…

MALICIOUS

PDF

79.1 KB Created: 2021-01-20 14:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f52a8d91aace15bc707971ca30002e6f SHA-1: 84a3938d618b7fa7a158e6918d67c22793cbbd36 SHA-256: eca7d72e09ab93b24ab791a6e411326cbd8d3c22ed08d806a0fbbc12f3140168
222 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to what appears to be a link farm designed to host numerous PDF files. The primary malicious link redirects to 'crophysi.ru', a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/123?utm_term=eastern+flight+401+ntsb+report In PDF document text
    • https://cdn.sqhk.co/tinipuded/iXic6jc/war_of_the_gods_movie_2016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5fcc2a7d94bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5fd78f355df43.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/ibU6Kgh/fallout_shelter_mr_handy_not_collecting_caps.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/6354537.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/ebwGUje/titan_quest_builds_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_6000bed2135ba.pdfIn PDF document text
    • https://cdn.sqhk.co/domojegibuze/djhjaad/strategy_pattern_java_real_world_example.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/jkghijk/kexuwuzorenavuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5f95febf0e598.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/rieghjb/sound_effect_ocean_waves_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_5fa2b03256f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f876412b21b4.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/d4e8ecffeb17.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/4QZ80d8/87345061603.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jhhf4hj/87778424812.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/8da2ea6fa9304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fafff145cc70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 5544 bytes
SHA-256: 08c1c9da743bbdba7e29fe9954b2ef075aa9cf25ca450de4048f870540b89e5a
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 10912 bytes
SHA-256: 998c87c6021db18416280df9600f5ec0f1e235c664ba03e199c2f99c0341dfef

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