Malicious PDF — malware analysis report

Static analysis result for SHA-256 647b041e508b897b…

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 06:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9379a7d3369dd93a2afd3713361b8076 SHA-1: 17b25c2139cfb22de78d60f86019fac1d9686be6 SHA-256: 647b041e508b897bf1145f07cbdcdff2f03a76274a833f4b3e96c6e7dfef441b
126 Risk Score

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains a lure related to downloading audio Bibles, which is likely a pretext to direct users to malicious URLs.

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://jottigo.ru/strik?utm_term=telugu+audio+bible+new+testament+free+download+mp3 PDF link annotation
    • http://burrrhey.tech/tokyo_ghoul_re_call_to_exist_ps4_pricenmfw9.pdfIn PDF document text
    • http://neo-tp.ru/birixepitomokefarudubikajsnnak.pdfIn PDF document text
    • http://lnstagrambusiness.com/16293650341fj9ks.pdfIn PDF document text
    • http://swiss-gear-top.xyz/67364210493ek1h1.pdfIn PDF document text
    • http://ukranews.icu/ncis_la_episode_guide_season_9bkjpf.pdfIn PDF document text
    • http://converstarget.ru/ligaes_nanda_nic_noc_download6hw2z.pdfIn PDF document text
    • http://emirofficialzm.com/how_to_use_total_gym_accessoriesvzwn1.pdfIn PDF document text
    • http://idealicaitalia-official.site/analytical_writing_assessment_mcqsiaars.pdfIn PDF document text
    • http://xtw2.club/unicorn_run_game_mod_apk7vps3.pdfIn PDF document text
    • http://summerita.fun/72568409867t79pw.pdfIn PDF document text
    • http://shoop-ft.ru/2nd_grade_math_worksheets_freepsjg2.pdfIn PDF document text
    • http://xitnet.fun/self_motivation_quotes97n1k.pdfIn PDF document text
    • http://domastmsk.space/4135029892300jlg.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/dewazewokib/ruvagodegise.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/14649766341.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 5708 bytes
SHA-256: db04419ab7203a136e2f5e493096e37ed01b91c64f0d29089060397095ecc2fa
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 11196 bytes
SHA-256: 1e4831f4dbe14c5c4c5b84a49e511f3a8d9c459c83915c935d7f96c3bb67d551
font_02_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 16160 bytes
SHA-256: 71fec8a3adfe41455811528c654ef740a0d97889ddd19e39e153b04b7507b7f0

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