Malicious PDF — malware analysis report

Static analysis result for SHA-256 0814c74ca9d6a6e0…

MALICIOUS

PDF

61.1 KB Created: 2021-01-14 06:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: feb199998364f0195b91788d858fecc0 SHA-1: dcff3c6d6b09f71f1138b4aac4f79d1fdfadc8cd SHA-256: 0814c74ca9d6a6e0d7f8880edf5c3f12c443d0123609ba0d0dd408b779e46c0f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, one of which is directly linked to the document's apparent theme of "Kanso cochlear rechargeable battery", suggesting a phishing or scam lure. The presence of embedded JavaScript, though not fully detailed, further supports the malicious classification by enabling interactive malicious content within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?utm_term=kanso+cochlear+rechargeable+battery PDF link annotation
    • https://site-1251700.mozfiles.com/files/1251700/tibalofojafimamarexeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8ae617b56f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fa9e93cd787e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5feefa097b204.pdfIn PDF document text
    • https://site-1168463.mozfiles.com/files/1168463/94050407220.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/IicnIKZ/ally_smash_bros_ban.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/vertical_packing_suitcase.pdfIn PDF document text
    • https://site-1177757.mozfiles.com/files/1177757/electricity_bill_calculator_excel_sheet.pdfIn PDF document text
    • https://site-1173658.mozfiles.com/files/1173658/manual_of_chess_combinations_pgn.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/aha_living_a_boy_s_adventure_tale_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5fd1186383f25.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB418 5272 bytes
SHA-256: 180cd071d74bfd2e63eba685693c35c7f73c3cb135c06d6771cd870d954346ab
font_01_sfnt_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 9756 bytes
SHA-256: 776057e4576de9e3dad14bf781a9d8227d66607fdf8fb9dc62d8ef4755cecb5f

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