Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a49630d6bcb9af…

MALICIOUS

PDF

73.0 KB Created: 2021-03-31 01:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 65f035a5f8e2923bc6eee56300da8004 SHA-1: 38010b0189deef5ff56cc9bc97dc1382c290deff SHA-256: 98a49630d6bcb9af136c380efb2f4b1c26666356c975cd72c0029151447028b6
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=how+to+fix+my+samsung+galaxy+tablet+won%2527t+turn+on PDF link annotation
    • http://hushseo.online/85738544258rjuz0.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/roneziwebakogufoj.pdfIn PDF document text
    • http://jobs-ingenieur.best/whirlpool_wdt730pahz_not_draining58gka.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/a9a2a2e43309c.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/iijjigq/end_of_year_report_template_word.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Shg2hfN/66919687879.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/telexozerew.pdfIn PDF document text
    • https://cdn.sqhk.co/zanewijepex/jicdEid/sasewamoderefapadoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/hjegdFT/9267995386.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/ajiUFie/hide_and_seek_app_game.pdfIn PDF document text
    • http://select-get.top/ferifinonewatslp1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb29561-33a1-4964-8d5f-c6532d6b486e/77137026170.pdfIn PDF document text
    • http://tudosipede.epizy.com/17495487841.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/faguwedukibovek.pdfIn PDF document text
    • http://baloxes.epizy.com/necromancy_spell_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f164f27a-d91c-4084-8554-4d5eb4542cff/pesoxumifepoxan.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/spanish_reflexive_verbs_crossword_puzzle_answers.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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 5484 bytes
SHA-256: 79e922871b9d5e0da6ceec0ab77cd13da130b6ec053af75cdee1acff3f4c1906
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11180 bytes
SHA-256: 7eb9f8ab6556519a161fb6d76d3eec7818b74bdad43c4e152e51b4348e09cc7d

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