Malicious PDF — malware analysis report

Static analysis result for SHA-256 851d7910dc4171b7…

MALICIOUS

PDF

88.6 KB Created: 2021-02-28 20:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc1341e6461f32e0603d020164655ded SHA-1: b73d31926731f28afbe13a223810f2758f178596 SHA-256: 851d7910dc4171b7f3e3bcea9561799acfe777f0ca20ffc743b2c98052808aa3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The primary malicious URL, 'https://nipisod.ru/strik?utm_term=how+to+clean+hp+officejet+pro+8600', suggests a lure to disguise malicious activity. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+to+clean+hp+officejet+pro+8600 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5fcc457f10244.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/31798548509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_5fe112a120748.pdfIn PDF document text
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/e9f8f171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_602828395a75e.pdfIn PDF document text
    • http://xruhdfo.site/love_letter_card_game_templatejv670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_600cfcbc69a41.pdfIn PDF document text
    • http://dom-bita.org/sony_playstation_4_slim_500gbtle8l.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/siwidakevavivuwukam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ff190d2e2a82.pdfIn PDF document text
    • http://shopsupergood.site/los_chakras_de_la_tierraiewgg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_600201d2dcf69.pdfIn PDF document text
    • http://handler-autoscout24.com/definicion_de_arquitectura_de_softwareqh3ag.pdfIn PDF document text
    • http://dududuw.mypressonline.com/can_i_turn_off_wifi_on_my_kindle_paperwhite.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/the_peripheral_route_to_persuasion_define.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd6da8218c93.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/juzukaroxufe_momogiromo.pdfIn PDF document text
    • http://geosen.net/78288492254kww0h.pdfIn PDF document text
    • http://lalashoppen.online/68791231956rh7bl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_6016118429a95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/how_do_you_troubleshoot_a_boiler_heating_system.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 5544 bytes
SHA-256: b42045bf35b600779a58d64824b001fa94714bf5e0b76fe048b385b45097384d
font_01_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 13252 bytes
SHA-256: 0c12e2e94949d6d35117883cb8c0bf49684ccc92a6716d38416e52783572fac5
font_02_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 16352 bytes
SHA-256: b4f90f29ec2ea84c6f5b923b5894a192b956c62465b16486fe13bd5d28b83e48

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