Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d5d3a443c276be…

MALICIOUS

PDF

81.8 KB Created: 2021-01-04 18:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d7ccf613b86e7eb3cf7bf2efe4c52d3f SHA-1: 70c2d86585f7322b85e92d9feb303f5b7d970633 SHA-256: b8d5d3a443c276be86acf004fb7ef6f806f4b84cf9759757fe2b92335440a583
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of urgency language ('action required within 24 hours') further suggests a phishing or social engineering attempt. The ClamAV detection and ML classifier output strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=iup+medical+abbreviation PDF link annotation
    • https://cdn.sqhk.co/wupifufexix/ejdKX7o/fire_and_waterproof_safe_box_amazon.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/rotugadibe.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/gh7hfgi/wikibujoxuzotu.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/nanuku-xogejog-fixozefu-buviwasatunu.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/hjqKX0E/pebodapebitewefon.pdfIn PDF document text
    • https://xavidupi.weebly.com/uploads/1/3/4/7/134723560/3286297.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/wfSZhgA/7373190310.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/069ccfdf-b50e-4683-ba3f-0894bafc79f4/76041071143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85c9d74-19b0-40f1-b40e-c18ec880215f/piano_theory_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b3a49e-3077-4bda-912c-4860177eae94/2552923616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96fefd6b-8761-4e0c-b704-3ecde4374c57/88464454710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab33af5-832c-434f-9acd-9225392dfdd6/kezurorasokiduzuveroveve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a59db9e-e826-4732-9a0f-07cae972fce6/gold_price_in_nepal_ridhi_sidhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464c7529-7451-4fb4-9020-6841767d135a/70743312840.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_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 5176 bytes
SHA-256: 9c4c7d48e1072b558f6b7d0399a5aa8554d5f488ca69d6e6f4208653600bbc3f
font_01_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 11928 bytes
SHA-256: 1971b8264950648b7bf68eb48c6eeeea5c6f00121a6106a59cc9953006ebed12

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