Malicious PDF — malware analysis report

Static analysis result for SHA-256 8125ef9f60fec280…

MALICIOUS

PDF

76.7 KB Created: 2020-12-25 15:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 27e4598e1033de50a9ba7b2329a512af SHA-1: 89fda2a539df79b0e85d20e83429779ffb9403e1 SHA-256: 8125ef9f60fec280dfa53c244fb08c259e6ebbd771ac6425087b6bd2e500e9c6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, traffmen.ru, which is flagged as a critical heuristic. The document body, though heavily obfuscated, appears to reference a worksheet, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/123?utm_term=10.7+probability+of+compound+events+worksheet+with+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f8bb9a5c0a33.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/RFTHRcD/odd_man_rush_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/UjegjoM/jarak_mimpi_basah_normal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_5fa58b1b40813.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/chfsjce/best_remixes_on_spotify_2019.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/a084695c-230a-43a9-97a0-cb6928acfe7d/mejora_de_procesos_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/espncricinfo_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/demonstrated_synonyms_thesaurus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcc45de-5b30-44da-90e9-34be3967da5f/dupejevibuvuvuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59762747-b777-4ed5-9c36-6362fef140b3/action_verb_and_linking_verb_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09609d87-2925-48f8-b54c-3590d1212bc6/vugozuvududolux.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/1477602608.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/banunozinawinomik.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/animal_behavior_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/temuxow/pojukakapumesojivisom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0a266e-472f-415f-a04b-5ed22a0b5fbd/zezasowupon.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/45253004164.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 3384 bytes
SHA-256: 3b77eed537e79711c2f35380b3fdc6fb9472797a8b614a2b3e738d7ccde8a1ad
font_01_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 6064 bytes
SHA-256: 72e805d5a2840aa2f84d76ff3e22b6c4f21d18e4f780827c261a65d88111d943
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 11012 bytes
SHA-256: 621e26c22a826e2c0d953ade08cb2382115b5d5a2da305e4f470972c64e2784f

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