Malicious PDF — malware analysis report

Static analysis result for SHA-256 0066ef0a1a06f825…

MALICIOUS

PDF

77.3 KB Created: 2021-01-10 15:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 11192f489a2544550dac9f111315b2ca SHA-1: b2f319ee411e0f4e02597896e74159db68fdbb3d SHA-256: 0066ef0a1a06f8256935b6c4c939ee260652f74adef8f3956ee8ef3ff7ca9860
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to `https://cctraff.ru/123?utm_term=new+dorp+high+school+address`. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, including `https://s3.amazonaws.com/rutufokedizon/69345704240.pdf`. The ML classifier also flagged this PDF with high confidence. These findings suggest a phishing or link-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=new+dorp+high+school+address In PDF document text
    • https://cdn.sqhk.co/baxilutifi/jb2idgj/the_maze_runner_review_book.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/2Shb2Ai/rescue_911_tv_show_episodes.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/0a3f7.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/wefefezok.pdfIn PDF document text
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/2124302.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/rutufokedizon/69345704240.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/solar_eclipse_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/lagu_1234_chennai_express.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/kufuwemapitok.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/welcome_letter_to_parents_from_coach.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/scratch_application_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/whats_tracker_app_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/deus_ex_human_revolution_weapons_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/baby_songs_in_tamil_movies_free.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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 5396 bytes
SHA-256: 47b9c127e5a419dfe3ab730c5f30e51de633a49bd4fa17ae0694dad876093d9b
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 11076 bytes
SHA-256: fe80166199b25dfd8ea0d594ebe55a4b6a92c0007abce539dfe72469db9132c7

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