Malicious PDF — malware analysis report

Static analysis result for SHA-256 843abc972abfdff0…

MALICIOUS

PDF

58.8 KB Created: 2020-12-18 10:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 702ec5b001a63134f199f4e87369b9e0 SHA-1: e3bb311fca418064d9b3ea346b33088518840ca6 SHA-256: 843abc972abfdff0f03039eea564d433904bfa29a5f9e28b657c3e9766843cf9
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a mass of external PDF links. One of the primary external links identified is 'https://traffking.ru/strik?utm_term=aquel+fuego+que+cayo', and another suspicious link is 'https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/1642371.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=aquel+fuego+que+cayo PDF link annotation
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/1642371.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/lurutopobi/english_book_report_alice_in_wonderland.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/19684885510.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/13751815834.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/words_that_start_with_pant.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/96940011941.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/nunopijamosef.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/42912957637.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/mentiras_perfectas_capitulo_final.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/awakening_the_giant_in_you.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/2016_honda_pilot_repair_manual.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_off0000a9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B4 4992 bytes
SHA-256: 5cdf803db6717b38f4af8cf84ba061030bd868caaf7ff27d86dff525f5f256ac
font_01_sfnt_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 10456 bytes
SHA-256: 48e59e55063d985d5edabda020c8450265d5edf7cb8ac1f0d58024c06b1e17ea

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