Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3ed9735891e546…

MALICIOUS

PDF

85.5 KB Created: 2021-03-29 20:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 89b810038a9fdfe682f2722770aef64e SHA-1: 208f644147062605e07012d828e0de676118f577 SHA-256: bd3ed9735891e5460e9d04287659e0a7a40187e4a9d74a4ba9333a97085cf4d2
126 Risk Score

Malware Insights

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

The PDF file contains a lure related to job interview questions, which is a common social engineering tactic. It embeds external URIs, including one pointing to 'dugedepap.ru', suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://dugedepap.ru/award?keyword=wipro+desktop+support+engineer+interview+questions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5ff8760a3b36f.pdfIn PDF document text
    • http://linorusani.iblogger.org/tc_helicon_voicelive_3_extreme_manual_rus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461763/normal_5fe412434cdf0.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/37376699673.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/marlin_336_serial_number_starting_with_mr.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/64327294279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b594c020-265f-4249-994b-e4d5e9d2bece/fujukojixabekubisebolujoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8210c0-4cf0-41a9-b976-db79c79bca31/mavuburomakuvorusevig.pdfIn PDF document text
    • http://satovimowenijor.myartsonline.com/catalogo_andrea_ropa_2020.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/pes_manual_usmc_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d68db60-f108-437c-bc79-3012076001bd/42418757900.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/48860382621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d171f176-6fcd-40dc-8314-b1e89948d1e2/has_energy_always_existed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1598ba-55d1-46a1-9c79-9079ebf6e3d7/how_to_find_the_surface_area_of_a_square_formula.pdfIn PDF document text
    • http://bafimilatape.epizy.com/32004966290.pdfIn PDF document text
    • http://zaximibirada.epizy.com/arturia_beatstep_pro_manuale_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063e3c47-f669-44c6-b813-7dfc39316513/99364598977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9373cc7-7d6c-4ee1-87e8-14665d7b404f/gugidakolubowin.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_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 5532 bytes
SHA-256: 1201eba49b03908b3fb3ae31ccf46442d99a6bcda029a30d8fd465d69c24f5be
font_01_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 11976 bytes
SHA-256: d950c611804e06bb7b29f01d1ad69426482b60a3ff11b675189ef5d3d194ba5d

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