Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb23b50632e9622f…

MALICIOUS

PDF

73.7 KB Created: 2020-12-28 04:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eed692967584fff48037a05f4a82a37 SHA-1: 5163aadf163bae032e6a264ab604b01768d1ccbe SHA-256: eb23b50632e9622f8bea1e7dd1e898ca48f8fe3986474f3cb11fc9bbb993acd4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to Weebly and sqhk.co domains, suggesting an attempt to redirect users to potentially harmful content or phishing sites. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly indicate a malicious intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=can+you+escape+the+room+6+level+25
    • https://cdn.sqhk.co/tuwagezo/ifCQNhc/empire_war_age_of_heroes_apk_download.pdf
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/7145817.pdf
    • https://suviliter.weebly.com/uploads/1/3/1/4/131453542/7918bb20b8.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/nebagixad.pdf
    • https://cdn.sqhk.co/papusabefo/gglhhOb/kibelusika.pdf
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/tumuwukoj-voralixijux.pdf
    • https://jobuvofuwado.weebly.com/uploads/1/3/1/4/131483112/c4b5710cfbb4.pdf
    • https://cdn.sqhk.co/ravawiku/Vt5olao/stickman_sword_fighting_3d_apk.pdf
    • https://fidinavaxevipew.weebly.com/uploads/1/3/4/8/134876378/ffd6a7973d.pdf
    • https://cdn.sqhk.co/masamiwe/H3gdDji/santa_claus_run_game_download.pdf
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8a0bc339c52.pdf
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/cc0422c473.pdf
    • https://cdn-cms.f-static.net/uploads/4463300/normal_5fd9b772d5aaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevopemosod/niriketol.pdf
    • 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_off0000e531.bin
3443d9ae23cc1e05e6a890a0fe2e6b287ce912ef50acdce70221a0b7860ae9c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 5652 bytes
font_01_sfnt_off0000f84a.bin
cdc557dff738ff5d34bdfbd802c051999eb2be515041a9fbbfc8f53bda00c769
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 9888 bytes