Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74da4049d7b85b8…

MALICIOUS

PDF

75.4 KB Created: 2021-02-03 00:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 80b34af1bead95524182804d9e602598 SHA-1: 2d2071b83cb7946f4808a8f5327bc9d7f3b132e3 SHA-256: d74da4049d7b85b8f78aae3e0d418e784250d83233a1905901b48212646e95ea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

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://maypoin.ru/aws?utm_term=automatic+control+for+water+pump+pdf PDF link annotation
    • http://trafikcezaodebayisi.com/watch_live_nfl_thursday_night_footballj3f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_6013dc58cc2ca.pdfIn PDF document text
    • http://alcexpress3.xyz/kurunewuketomiriv9ojp.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/31ac49322.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/fungf6R/25247911226.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/dhgaie5/nukunifofunovojewupixaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_600522251db4b.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/lurolemube.pdfIn PDF document text
    • http://help-copyrightservice.xyz/diamond_quest_don_t_rush_cheats0hwov.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/Dhdfijs/alien_arrival_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/gemiix2/48233828473.pdfIn PDF document text
    • http://elinekici.online/bulemijilepase30o10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fd282ca087b5.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/vonutavekip/90863969394.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/english_test_proficiency.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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 5204 bytes
SHA-256: 6bb6374f3849dbfbeeaf286c6400ba971ce87df4245f37f2e859985e425b43ab
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10532 bytes
SHA-256: 6601f169c836beb320233feea842b59f9177901b254b355e976e55d78df16d02

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