Malicious PDF — malware analysis report

Static analysis result for SHA-256 effaa8fd860994d6…

MALICIOUS

PDF

78.9 KB Created: 2021-04-09 01:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e794907690257248bc1ee6ef7bc12b72 SHA-1: 486f897e08eea50ff1a8a19947b9ba55258ee3af SHA-256: effaa8fd860994d6b773eb60a09b2a424a623dfb1dc8afa7471488cdc82a61d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to drive traffic to a network of linked sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+prepare+buffer+solution+of+ph+7.4
    • https://dofebafedu.weebly.com/uploads/1/3/4/5/134588227/23206fd87.pdf
    • http://linozelosezezis.22web.org/ledizamemoseligijelob.pdf
    • https://cdn.sqhk.co/gikunixa/jIgiwKP/msi_afterburner_beta_or_normal.pdf
    • https://cdn.sqhk.co/wamamuli/ashfhc9/bachelorette_party_invite_template_free.pdf
    • https://cdn.sqhk.co/somepizeko/PhgghvL/murder_mystery_2_codes_that_are_not_expired.pdf
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/392200.pdf
    • https://cdn.sqhk.co/sosobita/nYgdwgi/86200911700.pdf
    • http://kupawawade.22web.org/jofudifinofiwutisi.pdf
    • http://vavawosasote.iblogger.org/dabovelimilavamoso.pdf
    • https://sovokuragul.weebly.com/uploads/1/3/2/8/132814371/9afaa08.pdf
    • https://cdn.sqhk.co/nigalasiline/hjhfEge/60616045558.pdf
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/dufirit.pdf
    • https://cdn.sqhk.co/ferorigife/O3yoiad/jewugusajunuli.pdf
    • https://cdn.sqhk.co/rojozedofaf/wjiW6XO/birthday_cake_pictures_for_boyfriend.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_a16676fa657e44a9acb27a61351f4c85.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2d40f3d-1d1d-46bf-8077-22fe0934c708/nusomugizameman.pdf
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_6369d309373d41a0ae5fc7ede4b39259.pdf?index=true
    • http://fovadodal.rf.gd/what_are_the_rules_for_parallel_lines.pdf
    • https://uploads.strikinglycdn.com/files/2fe4f89e-04ec-48ae-a409-279ed60093c7/minuponufelofawobi.pdf
    • https://uploads.strikinglycdn.com/files/76e11218-f44d-4169-9cc8-99efe6aabd3e/throne_of_glass_complete_series_hardcover.pdf
    • http://kodigejo.rf.gd/jobatelipotexanubiwavox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cd.bin
1bdfddab53e20ba3a2cc0c899f46dd69f30479a77891adaa8030d910015da2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 5384 bytes
font_01_sfnt_off0001092e.bin
a00ec555b9dfb953effad947178ec04307a0bcfc8a772c16b0754a5f225fdc49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10916 bytes

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