Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80f1feda4fc4497…

MALICIOUS

PDF

65.9 KB Created: 2021-03-06 06:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0ec8e1d9ce1f495543e2f7a92bb35e07 SHA-1: c69b7e0930b95ed8e204aa7e109330c8e1a1fd8f SHA-256: e80f1feda4fc4497a511f518ebb55ea3ffc55aee0966efbd9161b583226b939b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious intent. It contains numerous external URIs, with one pointing to a suspicious domain 'mezovuduw.ru' that is likely used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a malicious purpose by identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=generac+3100+psi+2.5+gpm+electric+start+residential+pressure+washer PDF link annotation
    • http://lavka-karamel.ru/vanewtbmby.pdfIn PDF document text
    • http://salonhq.xyz/mcq_anesthesia_free_downloadffba0.pdfIn PDF document text
    • http://fb-copyright-help-from.com/45087408320leebb.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/0f01bij/basketball_court_length_in_yards.pdfIn PDF document text
    • http://afracheat9.xyz/malayalam_song_ambalamillathe_aaltharayil_vaazhum0y7nm.pdfIn PDF document text
    • http://cparta.moscow/bakery_business_plansrwo0m.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/1idk2wX/ninja_turtles_2_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/hjuhLBw/devil_s_candy_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/zpy6qic/kewepavumaza.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/a0vGWUE/60220804579.pdfIn PDF document text
    • http://site-shop.xyz/is_lincoln_corsair_a_good_carh04pg.pdfIn PDF document text
    • http://usmileofficial.site/dissertation_sur_le_civisme9ghb7.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/fjgeheA/wepemesadolepidipozedo.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/XRLirwi/allen_theaters_drive_in_las_cruces_nm.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/mijumomub/100_photo_slideshow_after_effects_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/mimamaparenabosozosedodu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/zekexudazaxaxusatorateso.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/chronicle_mysteries_episode_guide.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_off0000c358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 6256 bytes
SHA-256: e5a90306438ce3cfc8ad46f52611ff25fb9baefa44b826897732cedd9c446a8d
font_01_sfnt_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 9676 bytes
SHA-256: 52f5395b83124c67ec55dd852fed857cc484337b8e2cc88ac5dbbb112236b0b4

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