Malicious PDF — malware analysis report

Static analysis result for SHA-256 49738a584953703c…

MALICIOUS

PDF

74.4 KB Created: 2021-04-28 01:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96e6595cab1f9ef7539d90a9564f3f7c SHA-1: d4f353a2eb9169892a174246eae3559bfed0fb9f SHA-256: 49738a584953703c461a8ed365135c7417486bbbbac89118ffdd5e9a4477667c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=bose+solo+5+remote+codes+lg+tv PDF link annotation
    • https://cdn.sqhk.co/dalegoti/icjbggX/implosion_never_lose_hope_full_version_free_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/hafugfs/gun_master_g9_movie_ringtone_download.pdfIn PDF document text
    • https://taninuto.weebly.com/uploads/1/3/4/6/134633468/dafefonegilup.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/ieOQPhx/53787229458.pdfIn PDF document text
    • http://sikuwolawotoja.22web.org/5308443482.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/0c5ca7acb5.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/sigiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000e4f4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000e4f4.bin)
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_cf4a851491d0490090a29856250a78ea.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_cc689a1e1f9d4dc086ac4fa0a32f5275.pdf?index=trueIn PDF document text
    • http://zajegugolex.epizy.com/50876015074.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/ielts_reading_practice_online_with_answers.pdfIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_1bc16c9e0a824bb2b23da1bcabcfbe58.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_4d141ff6314344cfa4c407386bb15a81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/dejexekanifafosapumezom.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_32cd36a5d7714d48af148b86a3728671.pdf?index=trueIn PDF document text
    • http://nusavigosewu.epizy.com/95987338423.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_f6aa6d5b74ed41a0b0c54a88a44bf8ea.pdf?index=trueIn 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 extracted file (font_00_sfnt_off0000e4f4.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 5280 bytes
SHA-256: aea08bd0d6a1c5b6699e2bde1b500eb01b9cb5797700a1855111007b70943a52
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10988 bytes
SHA-256: e466c909a1a207061e3c5b0c114fdedc95bbcd8197440c35e144df4886f69daa

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