Malicious PDF — malware analysis report

Static analysis result for SHA-256 67908572bf7183f4…

MALICIOUS

PDF

78.3 KB Created: 2021-05-17 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d4be7c6da17af366111f4677b07cb1cb SHA-1: 6e4d44c12aaf8be0a2a75888abd7f8fa057cdfe0 SHA-256: 67908572bf7183f4d00195317b5415dc70637b7b44b511a764cfba09e685ff49
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://ponafet.ru/strik?utm_term=shaandaar+full+movie+download+hd+720p+filmywap PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5fe1b2fb51048.pdfIn PDF document text
    • https://lodufifed.weebly.com/uploads/1/3/1/4/131411197/72795b96dea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_6032aa29e5506.pdfIn PDF document text
    • https://mexunavogowa.weebly.com/uploads/1/3/4/8/134887210/1cf1ee8fb8563a.pdfIn PDF document text
    • https://zevefexa.weebly.com/uploads/1/3/4/7/134727867/mujujebenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/86735824741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfe64ca-fc1a-4873-8aac-6caae4a395c0/23986532178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f635fc77-801a-4bdd-9181-891a742b0284/how_to_program_pentair_intellitouch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9103d407-675c-4ba7-8707-16aa627a537d/easy_flowchart_maker_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c53b019-8799-46e2-a6af-9fbe4ee1eda2/safety_1st_baby_monitor_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1cbe31-50d4-4b37-baac-a0a20cc991f6/39487474531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd24394f-e481-4c42-a207-810584605db1/intermatic_timer_t101_wont_turn_on.pdfIn PDF document text
    • http://xojorefalez.rf.gd/nemadiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/bewagegilufusenu.pdfIn PDF document text
    • http://vatoduk.rf.gd/class_12_biology_syllabus_2020_20.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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5816 bytes
SHA-256: 11b162a1018a32215741f0a35824ce0367ee990fa2e5decadbf9bb01a2b0e3de
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 10852 bytes
SHA-256: 6269de5536b9a1bf5186b8e20dce21c2af30772059d77ceec27953f98646fc89

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