Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b6fe5bd1003a41…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 18:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 196251ad955532ba02996286a71e7f28 SHA-1: e3f639fd2ad230f77620af7686480628b29baf5d SHA-256: d8b6fe5bd1003a4112438691a5fa783ebc50b23692eb81a9662171062ec0327d
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV and an ML classifier as malicious, containing numerous external links pointing to a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'game arcade mod apk offline'. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=game+arcade+mod+apk+offline PDF link annotation
    • https://site-1168125.mozfiles.com/files/1168125/6680832103.pdfIn PDF document text
    • https://site-1171694.mozfiles.com/files/1171694/how_to_draw_cut_the_rope_2_characters.pdfIn PDF document text
    • https://site-1173293.mozfiles.com/files/1173293/15933502061.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/jfiadvY/youtube_studio_combine_videos.pdfIn PDF document text
    • https://site-1171649.mozfiles.com/files/1171649/xefafakefafuzuzunazarat.pdfIn PDF document text
    • https://site-1173140.mozfiles.com/files/1173140/lejisenotipu.pdfIn PDF document text
    • https://site-1176821.mozfiles.com/files/1176821/lowes_refrigerators_lg.pdfIn PDF document text
    • https://site-1176460.mozfiles.com/files/1176460/abstract_canvas_powerpoint_template_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fd36a26e2bc0.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/hicmMhc/feudalism_pyramid_hierarchy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f9830f76959f.pdfIn PDF document text
    • https://site-1178850.mozfiles.com/files/1178850/kusalokaguxonepom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 5216 bytes
SHA-256: def158cd6f2abbb1df7064a27965ce1469b4cd5ea67c5128597593678676e690
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 2252 bytes
SHA-256: aeee9b2fd577c594ede074a7e3493832e024aab8d381a7c1d16527c2e435dd06
font_02_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 11080 bytes
SHA-256: 00e915dfef0d8ea9b02eff6b8c9ae459fc7bee7dd51809793c471a1f70744547
font_03_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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