Malicious PDF — malware analysis report

Static analysis result for SHA-256 268dcdaf250136e4…

MALICIOUS

PDF

78.2 KB Created: 2021-03-10 02:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 175aba4ac2b81939bdeb3dfb4db36dc9 SHA-1: c530ed7b7522675fea2aad421fdf93c989550851 SHA-256: 268dcdaf250136e4a1ad3314762d0bb5c50a4faee8601b5b850ce123da30b50f
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 0.9996

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://kuzutuzo.ru/123?utm_term=logo+dls+manchester+city PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365541/normal_601710570fbac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603484a2c39ea.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/ruwanizapusojufezijap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383574/normal_5fc591a0638b5.pdfIn PDF document text
    • http://clubstore.pro/battletech_gameplay_2020tnpj7.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/86505939379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_601072f764fac.pdfIn PDF document text
    • http://1yamal.space/30678498506kth8a.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/how_much_to_replace_highlander_hybrid_battery.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/the_hiding_place_movie_2000_trailer.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/69284031060.pdfIn PDF document text
    • http://spencermcman.us/11483152760i0fmf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_3cba82b1c306457cb8827b1568998feb.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_4e648ca574474c00b4354e93b6da889c.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_e825166576244276ad8e022751af0e65.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_9bc521f134ac402fb1f902889ee405a4.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_752a72ae53574732891f5a46c6aadb7b.pdf?index=trueIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/37261632347.pdfIn PDF document text
    • https://508993f8-b81b-48eb-bc39-b0c4eecf7246.filesusr.com/ugd/205ae4_f4c780b3e55341319aa6f6d9468a2f9f.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_59f84b0eaac24ca6939c451497ed3509.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_4d15519740ff41b9b5aa0db83aa702f7.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_970cfb4856a94ec687dfd75c3d4eeb42.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 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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 5396 bytes
SHA-256: 5be7ce74265b0e45f491c02dc0f89644bfb36b3a35af27f93b3b5642f4f15a0b
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 10964 bytes
SHA-256: 23f519ea1eb47548c83c4bb07cb8b7b0a0c875239be6b62548573299a584cfda
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449