Malicious PDF — malware analysis report

Static analysis result for SHA-256 158df2d496b0bcf8…

MALICIOUS

PDF

60.3 KB Created: 2020-11-25 07:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: abde8fea7f2a0cb7477ffeccf418c784 SHA-1: 6aa57eda62a317e08c981d16e3f56a27132cd970 SHA-256: 158df2d496b0bcf802907bf4bea030e0e04d6c12fd7a009b47e7b374a5dd32d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary malicious URL being `https://trafffi.ru/strik?utm_term=hello+kitty+bow+tie+suv`. The presence of numerous external links suggests a link farm or phishing attempt, aiming to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=hello+kitty+bow+tie+suv PDF link annotation
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/af2f70a8145a8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_5fa6d3b516725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5fa9022f367e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5fa43bf7a4294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5f99dfea31383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5fad5bc06233b.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/640684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f9517da8d968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fae0477141ae.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/86731ff4-574e-41cd-987b-898d0f40c4d7/31177134599.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/endeavour_energy_report_outage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f602406-5b7a-4980-b724-09e27a15badc/56959944384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f845acd2-c92a-44d2-b6dd-4727ac27510a/ejemplo_de_rango_en_estadistica.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/free_plans_for_a_shoe_rack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b1b4bf-223f-4e1b-8154-085ed627f5ff/xifebefojozofafijavexig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7871ecab-b8e5-4920-af1a-f42ae21ab2b4/70819084278.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_off0000b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 4792 bytes
SHA-256: 273f3e7acf2df97adf440bba723bcba101a441d5006c287b27957bf9dfb9390c
font_01_sfnt_off0000c1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 10304 bytes
SHA-256: 2d9b13678c4f70ed226fbca95c18cf3c8c732ab68bda32ce159040652b904a60

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