Malicious PDF — malware analysis report

Static analysis result for SHA-256 891ab9d71b9c5b9a…

MALICIOUS

PDF

66.9 KB Created: 2020-11-19 04:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b467c94258f0b1ab311bbfd547225cce SHA-1: 7390ebd3c7fb1e26800d65509ab103d5eca26cb7 SHA-256: 891ab9d71b9c5b9a2dd15f26892a12bfc01de3e2671ed876cf141c4b48d44db3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'traffking.ru', a domain often associated with malicious activity. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a potentially malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=the+modern+flower+painter
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f920fdd64e44.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xereromejiv-koxozirusoror-moxonujis.pdf
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5f998ea48af88.pdf
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fb372b4487e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosalizuzu/scratch_android_app_inventor.pdf
    • https://s3.amazonaws.com/sanekufiwumafo/tagalewoxotobitopujexa.pdf
    • https://s3.amazonaws.com/pubopelej/67506048791.pdf
    • https://s3.amazonaws.com/robumuduluwise/btd_battles_hack_apk_iphone.pdf
    • https://s3.amazonaws.com/sixenogafopoj/wojin.pdf
    • https://s3.amazonaws.com/titugome/chesterton_community_sports_college_ofsted_report.pdf
    • https://s3.amazonaws.com/rimejiguvif/alucinaciones_y_delirios_libro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c644.bin
925daf1542a27e03eb0acb326c4d3123c753993c89cb9cffa136e39fb3d1fa85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 5144 bytes
font_01_sfnt_off0000d7aa.bin
bd07409e7ca1e86b1f9c3a72211e8df3134c5daf4383559d07b410192a1c4486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 12384 bytes

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