Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb124bf0706e05b…

MALICIOUS

PDF

75.7 KB Created: 2020-12-27 05:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3b8f7b4b653555e75c8703cfeb4ae693 SHA-1: 914c7e89b5a82ddc5d36fdfbf7cfa91c19822f6d SHA-256: afb124bf0706e05bfb9d4f28b624e6061a980cf8f312c5205f471600fe53b33a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains a lure related to Microsoft Authenticator and MFA, suggesting an attempt to harvest credentials or session tokens. The document also includes a link farm with numerous external PDF links, one of which points to a suspicious URL, likely serving as a redirect to a phishing site. No scripts were extracted, but the presence of external links and MFA lures strongly indicates a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=microsoft+authenticator+app+qr+code PDF link annotation
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/167c1e899a4df.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/EQ2ghgo/buck_hill_racing_team.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/pjdhhKH/trainee_dental_assistant_jobs_brisbane.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/zhhghib/life_of_a_mercenary_guide_assassin.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/bededuxotulapil/la_cicala_e_la_formica_poesia.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/54131301103.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/torrent_the_dark_knight_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/ontario_auto_accident_report_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/contoh_proposal_skripsi_akuntansi_keuangan.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/ketowerunipig.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/astrology_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/snickers_nutritional_information_fun_size.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/48528165343.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/54085756802.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5340 bytes
SHA-256: f8c7df5379912f8d648a306eeb68182d87e081112f66acba72ced058410e7be4
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10984 bytes
SHA-256: 06b703f4e86bbe01bba2661930cafe30a1f726f318db6f372351ba0bef5f0af3

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