Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e8540a3caa92e5…

MALICIOUS

PDF

70.8 KB Created: 2021-01-12 00:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5cbbf0f792ac9057530a5e7d3b78516f SHA-1: ae478f301705ae2a97e28a8a3f2b405ca7f92010 SHA-256: 94e8540a3caa92e5aed97bb0a7950d5427f3ff768bf121a416a0158e09fef01c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=break+cards+for+students+pdf PDF link annotation
    • https://site-1194115.mozfiles.com/files/1194115/monster_energy_supercross_game_ps4_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/HkUDjee/zamesirutifebipovetozaban.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/78115696390.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/869fd4ce01.pdfIn PDF document text
    • https://site-1172276.mozfiles.com/files/1172276/37224876223.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/nearby_friends_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/c4OheaU/xizujanabotili.pdfIn PDF document text
    • https://site-1171720.mozfiles.com/files/1171720/89772333663.pdfIn PDF document text
    • https://site-1168179.mozfiles.com/files/1168179/arcane_quest_adventures_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/gfYUrii/pixel_car_racer_gtr_r34_tune.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/australian_super_balanced_fund_performance.pdfIn PDF document text
    • https://site-1177196.mozfiles.com/files/1177196/daily_equipment_inspection_checklist_template_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/0NkhjmP/great_battles_medieval_thd.pdfIn PDF document text
    • https://xapukuzikoki.weebly.com/uploads/1/3/4/3/134381416/2386203.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/wufujudisu/decision_matrix_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/tidisasof.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 5232 bytes
SHA-256: 009fc1e370b418b4272be84ec605d4faa6b23dc2175d7db3ccf1ea3e4420cb61
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 9932 bytes
SHA-256: a3c575feb1c5cfe0ecf1f4dc6705915371a05689145457624b2622c949d64a87

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