Malicious PDF — malware analysis report

Static analysis result for SHA-256 add8ecd53d1614a7…

MALICIOUS

PDF

88.4 KB Created: 2021-04-02 11:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48a22070808fa001078ffe7b66955a8c SHA-1: d5f9aab8a015647c60f315cfd7a4164ce8370436 SHA-256: add8ecd53d1614a780dd813d1768db280461b3965a6a5a19c5a76f3b15b372e4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics point towards a phishing or malicious content distribution scheme, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=aussie+open+2020+dates
    • http://nat-fru.space/how_to_reset_honeywell_air_filterah0qt.pdf
    • https://cdn.sqhk.co/pivugituxi/ifQia11/kudavazi.pdf
    • https://cdn.sqhk.co/rinulazopun/pOraCih/nupufimem.pdf
    • https://cdn.sqhk.co/sirijunubi/Cjg2jcD/18488412656.pdf
    • https://cdn.sqhk.co/tisufupujeli/bWibheU/elite_army_training_camp_2018_schedule.pdf
    • https://cdn.sqhk.co/gemadaruvow/S53p1Ai/7118403972.pdf
    • https://cdn.sqhk.co/juxerawabuf/LvibFJD/52678159636.pdf
    • https://cdn.sqhk.co/nakolore/Dtgjjdc/64822061867.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://nosinoski.shop/how_to_connect_afterglow_switch_controller_to_pcpj8rf.pdf
    • https://cdn.sqhk.co/zogameva/jbXqhfz/telepsychology_50_state_review.pdf
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/vujutuwex.pdf
    • http://bagururidafu.22web.org/pifafuvepumogijodekulafot.pdf
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/3465753.pdf
    • https://cdn.sqhk.co/repudodo/haUgfoX/24109928246.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://relixaweb.rf.gd/scientific_journal_articles.pdf
    • http://rokipomufudivef.rf.gd/criticality_accident.pdf
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_085b8eb032714359b62f31fd46f9efa5.pdf?index=true
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_821b5c2065a34e03a76a79b780f53786.pdf?index=true
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_8a0adaca3b5349cca016acd46646a2ca.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_71e662fa3f404e029c4cf20f5e06765b.pdf?index=true
    • 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_off00011581.bin
1e899eb146d560d71588fd537ae74adbad569fcb0c8120ccc2954016861f6907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 5088 bytes
font_01_sfnt_off000126ea.bin
519fcddd8fa8c6be0300abe96bad6ea3fede3a42f4f28fba830879b894527f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 15720 bytes

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