Malicious PDF — malware analysis report

Static analysis result for SHA-256 77932e820d309ba1…

MALICIOUS

PDF

81.8 KB Created: 2021-04-13 05:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2ac172fa2e7ee8ff8dc75515e686a17 SHA-1: 5cf93324200d682201f518cf6bd6bb4df798f3a6 SHA-256: 77932e820d309ba1825cbc2f50934a117715011be1bb372d3365e79307f543a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=what+is+les+miserables+staged+concert
    • http://fumatiw.mypressonline.com/xepaxojorenid.pdf
    • http://kirazoki.22web.org/what_happens_in_chapter_11_and_12_in_lord_of_the_flies.pdf
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/gogogagexim_jazagilegiv.pdf
    • http://detonic-ro.website/dls_19_mod_profile_daton13m.pdf
    • http://nesobaka9.xyz/what_to_ask_when_buying_a_new_car_singaporeoos3k.pdf
    • http://gusimaziwagax.22web.org/59708077942.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/rozagomukovoseburus.pdf
    • http://vandify.com/ramanofubawakogul7iatv.pdf
    • http://remastacer.com/xukabafo4pkna.pdf
    • http://remontlegko.info/231688701990pxs4.pdf
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/c22fd4893c21f4.pdf
    • http://istlan.space/pinakunutufefofazijepip867n.pdf
    • http://roxetoxuved.mywebcommunity.org/vekedowimizeke.pdf
    • http://wiinorama.fun/good_tan_dog_namescljoo.pdf
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/tewotobifononenawu.pdf
    • http://fepaporipevari.mypressonline.com/clinical_anatomy_moore_6th_edition.pdf
    • http://teagreen.space/729282851952xg9j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_74f41b54de7b4c8db5a2211403f92cc5.pdf?index=true
    • http://tikarere.epizy.com/frictional_force_experiment_lab_report.pdf
    • http://palibam.atwebpages.com/libro_alter_ego_a1_gratis.pdf
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_800633f7b2ad4e419440332827a974cf.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea76.bin
404d745650c04448c114263052f8248143da14d54722794ebb3972eb9ef3315b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5508 bytes
font_01_sfnt_off0000fd0b.bin
5247b0d2b3def8433d24e4af174f6dae3b75295f46ed2d0f6472dd9b768daa38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 11128 bytes
font_02_sfnt_off000122b5.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 16092 bytes

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