Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e5c66c487a4a46…

MALICIOUS

PDF

87.8 KB Created: 2021-02-26 12:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bda9756974d0fce84684011638593531 SHA-1: b8fcd0af36a5948e3ed483cf18efd86e92cbe3d1 SHA-256: a7e5c66c487a4a46507545eb9ee1b24cdf81219b58c823bdebe4c81de1b2599c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'xezojetit.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to reference product information, suggesting a lure to entice users to click 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://xezojetit.ru/award?keyword=sennheiser+rs-175+wireless+headphones+and+receiver PDF link annotation
    • https://cdn.sqhk.co/kedilexele/wiblijg/52617960231.pdfIn PDF document text
    • http://terugate.mypressonline.com/pasegerajavuveg.pdfIn PDF document text
    • http://jamedoxeka.22web.org/fire_lieutenant_resume_template.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/jI7hgjh/clumsy_fred_ragdoll_physics_simulation_game.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/gcmgchf/fitness_home_home_exercise_30_days_body_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/hahdUC1/arenado_trade_white_sox.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/Xjayhc4/18469224527.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/yOajbo5/gefiwo.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/jimunekisobufowoke.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hanhegh/64270053679.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/Ibjaidy/45564986356.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/Ehhgfhj/vorusibuj.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/7505169026.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzaxovojige.epizy.com/adani_enterprises_limited_annual_report_2018.pdfIn PDF document text
    • http://miviloliwibo.rf.gd/virek.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/are_dunkin_donuts_breakfast_sandwiches_good.pdfIn PDF document text
    • http://xiwagopa.epizy.com/eba_guidelines_on_outsourcing_february_2019.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/lizutupuvekobut.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 5704 bytes
SHA-256: 3d81f9d1679fc0437206da2f9ed387fd40dd5c8f4b05a912dbf3d269b32e7f17
font_01_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 12528 bytes
SHA-256: 832e672213768146b7221849e36c78076a41f13e6a130004e804106b7e91ef96

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