Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c55b53f59036533…

MALICIOUS

PDF

85.0 KB Created: 2021-04-28 01:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed755b63dca1001513cab2136a8d28fb SHA-1: 707639e75691aa6338b4cf29b167e0c8b30cfca7 SHA-256: 0c55b53f59036533659ca6cf50b307afdbb7079e8ebe5dddf7714b42903ad3a4
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 0.9997

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://crophysi.ru/strik?utm_term=sql+server+2008+tutorial+pdf PDF link annotation
    • http://gouliwer.online/43182081896bofaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/icEsgfA/74275392475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_606e91276f7b0.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/aTiahgX/6583910913.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/jhUzgdl/19977172235.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/fhiH0hh/baleful_synonym_word.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/cjbK0jf/53349783901.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/fijjfhh/nubatopujotixaxubul.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/zumaxeponumot-javapus-luxed.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/tnig1hi/angle_of_repose_in_pharmaceutics.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/W9A36PH/nusape.pdfIn PDF document text
    • http://artrosil.xyz/wikugimexw5yl2.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/jiH7mxy/five_ten_freerider_mountain_bike_shoes_ss20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fe20cdc5b867.pdfIn PDF document text
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/raxitixi.pdfIn PDF document text
    • http://makeyourself.xyz/3416749229ex1x1.pdfIn PDF document text
    • https://jixikasipad.weebly.com/uploads/1/3/4/5/134596843/xukasiwupiwijawaduku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_60357e96a523f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490725/normal_5fefecb4d194a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6965b7-6a0b-4763-88a1-3cdfc6949896/fisher_price_lamb_swing_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a448a57a-22fc-4a2f-9a47-ce5430218ff3/excel_exercises_for_beginners.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 5792 bytes
SHA-256: d6e4295091e0c200697f99fe1eb4e06dbc6bb7a2a671a8459f36d6558e9effe0
font_01_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 11576 bytes
SHA-256: fd91fe5b8c692e50866fd6b496bb0fb111330e0bc74d3de4d4a8af41c3621b0f