Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c20fe6fc05a0a5…

MALICIOUS

PDF

66.4 KB Created: 2021-03-28 17:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8ca0f417508a9b1194ebb391d61b38a SHA-1: 72410e7ced4031f6b338f80c9d77a5c70e279312 SHA-256: 93c20fe6fc05a0a5532814d8c52772d2dc12a94380c20d3c50d08223192f7c9e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('mezovuduw.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to government pay commissions.

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://mezovuduw.ru/award?keyword=6th+pay+commission+gr+maharashtra+govt+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471085/normal_6033489d9e6a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_603939618075d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_60482ef1a2bb6.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/28832706372.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/wererewumanisiveladi.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/capitalismo_socialismo_e_democracia_schumpeter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393901/normal_5fcc8de48a281.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/can_you_use_a_pack_and_play_instead_of_a_bassinet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/simujix/gumixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12d3ff8-ed5f-4846-ac6e-af7a3295ca87/political_science_books_in_hindi.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/day_by_day_armageddon_audiobook.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/55914339726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cabfda5-c374-47d3-9e5d-e26f4ac36808/navy_civilian_jobs_pay_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc87bb5-064b-4264-8930-3e2a78bcf720/60605843033.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/gawuwimovejawolotojasuzi.pdfIn PDF document text
    • http://fuzariwa.rf.gd/go_math_grade_6_answers.pdfIn PDF document text
    • http://dinajamabas.epizy.com/love_story_andy_williams_lyrics_terjemahan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8574f78f-5356-41a2-a792-25a143bfb3c6/76953065591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9313a56-8a70-4611-afb0-214707f1b88b/line_6_spider_iii_30_watt_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e72181-51c2-4878-b512-9bd97c22c8af/what_is_a_service_transition_plan.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_off0000c755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC755 5760 bytes
SHA-256: aebdc099d010013a642530b7a977e1b4963888f559cc8e6a0e2479f62c9ab47e
font_01_sfnt_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 9860 bytes
SHA-256: f0a7d171dc4b80d62be054a9dd0b723a8cd48adc85ecaceb772275caa33ac1c0

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