Malicious PDF — malware analysis report

Static analysis result for SHA-256 0242715b7a02d643…

MALICIOUS

PDF

80.4 KB Created: 2021-02-16 00:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1c40027e857377ca2cdcb7388f000a5 SHA-1: 295b3f1903c0564671dc0e764dd2ec4e19e57439 SHA-256: 0242715b7a02d643eb6ddb82adaedc449ecb674cfdff5c67937b5e828479dcbf
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=what+are+the+7+deadly+sins+spongebob PDF link annotation
    • http://ca-manalapan.space/38480729138weytr.pdfIn PDF document text
    • http://winoraama.site/catan_universe_multiplayernzfai.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/5837006.pdfIn PDF document text
    • https://susatabunek.weebly.com/uploads/1/3/2/6/132695662/bowile.pdfIn PDF document text
    • http://netewe9.xyz/vefunebagererellmke.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/zokironiwasigebog.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/hbjjhdy/snow_white_characters_halloween.pdfIn PDF document text
    • http://instapriz24.online/35949324723mj6m7.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/hfiiJzX/cutest_animals_that_will_kill_you.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/7332046.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/zukajix_duzafota_sinojidodut.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/kuGja2K/free_download_game_chess_master_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/gjgckK4/48111887194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuwumunis.epizy.com/67939483380.pdfIn PDF document text
    • http://karatufi.epizy.com/powerpoint_templates_certificate_of_excellence.pdfIn PDF document text
    • http://kafopazam.epizy.com/64353643361.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 6604 bytes
SHA-256: e9f1eef1b09acbe681eb27c8211c73bcd0ceb7face293a5b6bbafebb44861232
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 5556 bytes
SHA-256: 6d3da43b1422c131bd8a74716aeda7a59b8890c2c47a8f43fe1656871496a8b4
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 10392 bytes
SHA-256: 0140a57d6ea5fcaded647316bbeea997a662a75d6eaff958aaf8e4d2aeeebe9e

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