Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc80dbb54a4c2b0…

MALICIOUS

PDF

74.2 KB Created: 2021-02-26 12:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19313d06a1f57a3b38e86129b1667bcf SHA-1: 23bdc0b77a56f93beecff9f1089e61d7d85f1fd9 SHA-256: 6bc80dbb54a4c2b0095a38e4b2c8f36a8f750ffc47b74decd775c9edf6ee6070
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a technical issue, likely designed to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=samsung+led+tv+optical+audio+out+not+working
    • http://menbp.online/88686988088dm1wn.pdf
    • http://mainsale.pro/mawuzudakabinoxupusomafkja6.pdf
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/89ea0c06f.pdf
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/5826630.pdf
    • http://nokasosozigof.mypressonline.com/lg_tromm_washer_error_code_fe.pdf
    • http://juwapes.22web.org/concept_map_template_blank.pdf
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/735563.pdf
    • http://dawexefif.getenjoyment.net/41558183220.pdf
    • http://suziterunedoloj.sportsontheweb.net/banukezigowar.pdf
    • http://kiladuwujufuzav.22web.org/como_orar_al_espiritu_santo_de_dios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kesopepi.rf.gd/pentair_easy_touch_remote_pairing.pdf
    • http://vilepobafomunow.atwebpages.com/pemumififadelixawo.pdf
    • http://livirava.atwebpages.com/jumitosanusov.pdf
    • http://bijalefopate.rf.gd/pubatuw.pdf
    • http://piwakolipa.rf.gd/do_termites_have_long_antennae.pdf
    • http://gutekuretejapoj.onlinewebshop.net/blank_outline_map_of_the_world_to_print.pdf
    • http://laxakufas.epizy.com/8345496408.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_off0000e2a9.bin
9bffb203e4c336eea600ca3f043e7d61d09b0925825b75977ba547a98a5ec611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 5712 bytes
font_01_sfnt_off0000f620.bin
f874051a41b4e9692ab93091875d1865e13ae5d4e321ab9da0d2b0a2e39bb40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10884 bytes

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