Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61a57aa573f198f…

MALICIOUS

PDF

84.0 KB Created: 2021-03-12 01:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 334ce7e5ced7c9153616b52ced97b752 SHA-1: da2e04d8d23b6ed76cca4d52ec77f8407d0a30e8 SHA-256: b61a57aa573f198f32fb22cba0a6fc16ae56f52484b4644b699ec6f2df12a963
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://ponafet.ru/123?utm_term=class+12+cbse+chemistry+practical+book+pdf PDF link annotation
    • http://bavimobuxadu.medianewsonline.com/courage_to_be_disliked.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/6329552.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/expert_c_programming_deep_c_secrets_by_peter_v._linden.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/agYigaf/46991390425.pdfIn PDF document text
    • http://dabobez.22web.org/kidde_smoke_and_carbon_monoxide_alarm_recall_2018.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/84384451925.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/dgjBOAw/gomulovofojaratezusogaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/fpjeAbb/best_drum_machine_vst_for_edm.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/Hhh4Yif/dune_1984_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lujobitazeku/Ngc8jiE/5320145677.pdfIn PDF document text
    • http://znakomstva69.space/5771805113y22q9.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/8ZifXhh/pukiwusika.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/jezesogotidip_ribowogigo.pdfIn PDF document text
    • http://medyayazilimtr.com/the_lottery_movie_1996_summaryz09fp.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/jhimhcx/buxubedekusakogezef.pdfIn PDF document text
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/2522533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumomevafuvozup.rf.gd/13835299654.pdfIn PDF document text
    • http://kipixuge.epizy.com/nekuwinuzoked.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/how_do_you_make_pizza_dough_recipe.pdfIn PDF document text
    • http://lilufunom.epizy.com/bedexudolukikofugesude.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 5792 bytes
SHA-256: 1114dcaafdc5fafa639d5e3a469c6b70c8f6e141177a1f2752e39455831b4545
font_01_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 2116 bytes
SHA-256: c0b080a3303b8e939d585112c399c02879d5f0d732e84daf845a916286948345
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 11028 bytes
SHA-256: b3d980d26e1ba5d8a53fc3c07bde4a4223e0e69bd9b6ca533f22852d27af77aa

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