Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cdb27db295a461…

MALICIOUS

PDF

73.0 KB Created: 2021-01-10 01:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ada4ed5f4f8564c3af81db11658d0700 SHA-1: 7cc62d00d1df742eb617e891f947c7d7cb5c2387 SHA-256: a2cdb27db295a4610bb531eadc9eefdf940ccea72c08a730967bb1fb732c8b68
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=como+sobrevivir+en+el+desierto', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/123?utm_term=como+sobrevivir+en+el+desierto PDF link annotation
    • https://daletapobuwero.weebly.com/uploads/1/3/4/6/134666872/9590188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fee395e00344.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/latest_viral_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/jbifjjb/music_volume_equalizer_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/jcb2gj5/viwaxuvibipopo.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/hhJfihd/playstation_plus_monthly_games_january_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5fbfb7a1ed98a.pdfIn PDF document text
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/wufukaxuzogovaj.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/A3hhSib/ranef.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/mawipit.pdfIn PDF document text
    • https://site-1244316.mozfiles.com/files/1244316/33402269182.pdfIn PDF document text
    • https://site-1168326.mozfiles.com/files/1168326/wimexis.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 4868 bytes
SHA-256: 02170e721bb678100f4b16ab5b58465898b16ece4de6b1fa08965ebcc17a8741
font_01_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 11588 bytes
SHA-256: 5f9b8f99fbad079b7b54d60af63746364a650f4a6c1bd4e566376aea550893f9

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