Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb7a6845d6f580f…

MALICIOUS

PDF

77.6 KB Created: 2021-02-25 01:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de63f9ea51a1c1e9534770a583b89bfc SHA-1: 26857ee6d6d7637910a82658a4c3b990ab447524 SHA-256: 5cb7a6845d6f580f374e503d55dcab3e80f44307a570b45954fb574438c86ed0
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links. One of these links, 'https://seumenha.ru/strik?utm_term=super+brain+level+24+books', is likely part of a malicious campaign to drive traffic to potentially harmful websites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://seumenha.ru/strik?utm_term=super+brain+level+24+books
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/a34e5f75.pdf
    • http://beririka.scienceontheweb.net/dell_v313_printer_driver_mac.pdf
    • http://fekevopimibun.sportsontheweb.net/samsung_tab_ce0168_specifications.pdf
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/5375cc03e.pdf
    • https://cdn.sqhk.co/xugosovemi/cgdjeyo/private_pilot_jobs_florida.pdf
    • https://cdn.sqhk.co/sovokeduseb/ihjgPie/fantasy_football_name_generator_female.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bipedok.epizy.com/black_desert_mobile_apk_taptap.pdf
    • https://s3.amazonaws.com/goneduzum/babysitters_club_books_free.pdf
    • https://s3.amazonaws.com/wixanarer/57432763370.pdf
    • http://fejixusal.epizy.com/13029698529.pdf
    • http://nejesezape.myartsonline.com/94152467061.pdf
    • https://s3.amazonaws.com/liwara/96694855813.pdf
    • http://duwamiwimi.rf.gd/regegeluvuwibifu.pdf
    • https://s3.amazonaws.com/zarevizebi/dakedireves.pdf
    • http://pejezal.rf.gd/how_to_learn_korean_beginner.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_off0000f1db.bin
585e19467830c3055ec2735bbf3ae1cc5ec92133a8e08d4ad968fa86b985cebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 5400 bytes
font_01_sfnt_off0001044b.bin
a4ce407f23e42f97245a15bea8ee38e83bb623b8245f62df32ae902d6af51efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 10872 bytes

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