Malicious PDF — malware analysis report

Static analysis result for SHA-256 553f78c3670e0c74…

MALICIOUS

PDF

63.1 KB Created: 2020-12-18 03:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b39a6d3eb546a07da26824449f05ea22 SHA-1: 0b284cb7dddbfcb5874a2190a1ecfda11233a61c SHA-256: 553f78c3670e0c7482f3a354abca01f859a69f7c2c6e1c70fef480b10910226a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. One of the extracted URLs, https://traffine.ru/123?utm_term=ai127+flight+status+from+delhi+to+chicago, is likely part of this scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=ai127+flight+status+from+delhi+to+chicago
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/2b0b80938e745.pdf
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5fa7b7673e298.pdf
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/nijolabomaraw.pdf
    • https://zejaxosadakawur.weebly.com/uploads/1/3/4/3/134372542/kizowewak.pdf
    • https://cdn-cms.f-static.net/uploads/4501383/normal_5fc2208bd5f7c.pdf
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/vivelazutekobex_moxunidedo_puduzizinuwap_zogubepe.pdf
    • https://busununivid.weebly.com/uploads/1/3/4/7/134774072/5852644.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5fb836a68e74c.pdf
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5fd0b8189a7cb.pdf
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/vizigo_ravejejuka_juwuzagibegomed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/473b93d0-315d-4a15-8057-3b4335ba461e/the_legend_of_sleepy_hollow.pdf
    • https://uploads.strikinglycdn.com/files/1acfa143-e202-4864-b331-bddc9d189c2d/lofuno.pdf
    • https://uploads.strikinglycdn.com/files/c3ed926f-f785-4349-86c1-75b0ab54f48e/ejercicios_resueltos_sobre_presupues.pdf
    • https://static1.squarespace.com/static/5fc0e46f24b06a7eb3ff1788/t/5fc1888c4f9837572019da17/1606518924759/sadafed.pdf
    • https://uploads.strikinglycdn.com/files/88e7a823-8875-4cc6-951b-8dd0252032af/sentence_structure_lesson_plan_first_grade.pdf
    • https://uploads.strikinglycdn.com/files/421b098e-7b9b-4598-81cb-fa266bc8b70d/49119576865.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_off0000b7ef.bin
e1c283df320b1e7c5c50ca13cd10cbb6c67592f1427e207ce67cc20f72e5f9c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 5688 bytes
font_01_sfnt_off0000cb2d.bin
30491a854bf9f041a838afa0965da5e9b619812a7ffc5249b022a6e90ad03da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 10556 bytes

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