Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5793d0c6b9e79ad…

MALICIOUS

PDF

69.3 KB Created: 2021-04-08 08:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cbd9c59aaaa88e38ca24faf51d4b8c32 SHA-1: 238bdbe1092bde8911f3f9b59ac6d4cd9aefaa78 SHA-256: d5793d0c6b9e79ad326e15791e46bc252510ae3062cb8027a4c59048b314a9ac
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=ad%2526d+second+edition+player%2527s+handbook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387808/normal_600544bb5818f.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/tupatimudikarugurojil.pdfIn PDF document text
    • http://missunik.space/chikni_chameli_song_video_pagalworld61ojs.pdfIn PDF document text
    • http://sandiego-podcasts.com/noxivubukewolovayk2s2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5feb3b618868c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5fca9155bedc3.pdfIn PDF document text
    • http://creditscorecard.info/vifaramumuvaledaftsjf.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/which_love_story_movie_is_the_best.pdfIn PDF document text
    • http://dkblogin-de.best/pukebujelavabowamobomvkws1.pdfIn PDF document text
    • http://limaxinsto.xyz/what_are_the_most_rarest_monster_high_dollst9o0t.pdfIn PDF document text
    • http://reduslimitalia-official.website/53057009226qk5vn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_60312f47dc2ca.pdfIn PDF document text
    • http://volosaty100.xyz/xokopij1h3su.pdfIn PDF document text
    • http://front-glass.space/49138977727zpyrd.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/muscle_building_workout_plan_for_beginners_female_at_home.pdfIn PDF document text
    • http://aydym.club/how_to_replace_a_dehumidifier_filtern3vrd.pdfIn PDF document text
    • http://vivezotutune.iblogger.org/puxuravabevazuresen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_2960babf054b4fe8aa02530e09dbad7f.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_d3460e7ce0cc426192a496848985a996.pdf?index=trueIn PDF document text
    • http://furamexexi.rf.gd/un_grito_desesperado_libro_completo_para_imprimir.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/child_art_developmental_stages.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/personal_budget_sheet_template_uk.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_b88df36957444cf5abb874c621bb029a.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_f758231e1462471ca9d5cbb884e73e83.pdf?index=trueIn 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 4288 bytes
SHA-256: 2e6bb7efad062453be30b8c2aba000e0407cf2ba6af29b6ee47b80f531fb2cdf
font_01_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 9860 bytes
SHA-256: daffe7842334733f03f4c413beb9ac247af64c952a765431065fa788ffdfa0ff