Malicious PDF — malware analysis report

Static analysis result for SHA-256 befe60ed257a78bf…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 19:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3d841500f1e759a1540244551842925 SHA-1: b06df57336df047742aa2ffd297b90921326ad18 SHA-256: befe60ed257a78bfb0cda551c222462d7ea27fc5675cd25e5299153900040e6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=what+horses+were+used+in+ww1
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/6b80ffc96.pdf
    • http://yellownatural.space/lumipot32z13.pdf
    • https://nimugafibe.weebly.com/uploads/1/3/6/0/136084612/zubepovugasuwof-farusuf.pdf
    • http://bonifacy.site/bovogejagijef3zump.pdf
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/gomumilivol.pdf
    • http://veronaital.space/gikosilifegimupal4s6h.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://clipshd.design/toripamedusb85b.pdf
    • http://hurricane1.space/11608797562u9rxu.pdf
    • http://likelid.xyz/bollywood_best_music_songsf3j9o.pdf
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/24c12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tovanafinavo.rf.gd/83846504742.pdf
    • http://luredavum.epizy.com/cbse_class_12_ncert_chemistry_textbook.pdf
    • http://banamuf.rf.gd/rerorexuzek.pdf
    • https://s3.amazonaws.com/wixanarer/74645249812.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_41dd90d71ce743dc9f2e49d8ad3810f6.pdf?index=true
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_64c09f747ff24dc8a2218f13da252f7b.pdf?index=true
    • https://s3.amazonaws.com/jamuluvuvava/lovexuzajevem.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_55105824d1c5453eb7570ccd4cdfddf6.pdf?index=true
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_f5c0d8b02b754db69631452afc16c761.pdf?index=true
    • https://s3.amazonaws.com/dufekifaral/how_to_find_boomerang_links_awakening.pdf
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_5d58a75e65c146538a0934cd10e6b697.pdf?index=true
    • 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_off0000f0fe.bin
7ffc62d7ae003859a7ee5c5a7b837d45b5c13559d96d79619ca449baf9efd1f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 5036 bytes
font_01_sfnt_off00010232.bin
50d62b05b22038d2fdf6030228525d8dd534c5257d985c712de2a598fec993fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10644 bytes

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