Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ab916bc1dfe954…

MALICIOUS

PDF

87.9 KB Created: 2021-03-12 06:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba927c28d4f9034f6b20eb28b88e821 SHA-1: 937d629ee9d6cf4d235b792ad5887844dd9b7b2a SHA-256: c9ab916bc1dfe954d1096fa6112066f21be2e1a45cd964ce2fba6856e3ef0bb5
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though corrupted, suggests a lure related to software downloads, and the presence of embedded URLs points to the document's role in directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://ponafet.ru/award?keyword=software+to+convert+pdf+file+to+microsoft+word+free+download
    • https://cdn.sqhk.co/mewuwemiromi/zjaii15/2866716683.pdf
    • https://cdn.sqhk.co/bujasugawo/4zgcFqw/toy_basketball_hoop_walmart.pdf
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/671d525998ac.pdf
    • http://josebixotarez.22web.org/5822129208.pdf
    • https://cdn.sqhk.co/lotivadafe/ggdhbjh/xunozivapazifa.pdf
    • https://cdn.sqhk.co/wofikubid/xgirhes/tilunujuvinuz.pdf
    • https://cdn.sqhk.co/vuvupewog/c9jjjjE/22203579777.pdf
    • https://cdn.sqhk.co/laruxibut/Tia3Ogi/61315809443.pdf
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/limemero.pdf
    • http://hargotel.xyz/11817515864t38l6.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/9e76b1.pdf
    • https://cdn.sqhk.co/sobilowibid/hjojhMq/lausanne_2020_hockey_schedule.pdf
    • https://cdn.sqhk.co/wogokodu/ifnlFgh/vetilevonewotep.pdf
    • https://cdn.sqhk.co/wanevakaxuma/j6zjhX3/crush_them_all_max_artifact_slots.pdf
    • https://cdn.sqhk.co/vovewotutal/hcrhint/28325363144.pdf
    • http://xapepinozex.22web.org/zerozaboxibevezipurogufe.pdf
    • https://cdn.sqhk.co/neseleko/Djijfgc/dark_elementalist_lux_sneaky.pdf
    • https://cdn.sqhk.co/foroboreb/eJjhZZz/marvel_stadium_afl_reserved_seating.pdf
    • http://astrology-personal.online/vinanisoziloxbm8jy.pdf
    • https://cdn.sqhk.co/tavedikovo/TIohgP3/animal_print_carpet_runner_for_stairs.pdf
    • http://good-production20.site/is_diary_of_a_wimpy_kid_a_ar_book5pxud.pdf
    • http://gladkoe-telo.xyz/xoxesapesa5qm5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sulosuduvemog.epizy.com/outlook_template_forms.pdf
    • http://lilosanuzup.rf.gd/98802965715.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d0c.bin
f4eb6304dac712f775b3c02086ffb2eb359a531dc30f0cf02c3d836d974e61cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 5344 bytes
font_01_sfnt_off00011f25.bin
c566ed45111a14a5c05a8a6f5038fa2dd68ee54f2da1ad178eeaed9ebb3cb93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10412 bytes
font_02_sfnt_off000142d0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D0 4324 bytes

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