Malicious PDF — malware analysis report

Static analysis result for SHA-256 f921eff4da01025f…

MALICIOUS

PDF

87.0 KB Created: 2021-05-04 22:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6234e0400a3241d8430c142e5d2dadbc SHA-1: 7cde6c21683e9655f7b298b03bbab8d840e6ec97 SHA-256: f921eff4da01025f91787aaefe683f12d79773f64a155bd5dab2c9b799c206a2
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily corrupted, appears to be a lure related to a common search query, directing users to potentially malicious websites. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=is+there+a+filter+on+a+samsung+dishwasher PDF link annotation
    • https://cdn.sqhk.co/balijanawi/gGriihc/business_board_game_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/dwgPrib/5626574024.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/figthjk/car_racing_game_4x4_off_road.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/75136000799.pdfIn PDF document text
    • https://xagiwejobumumok.weebly.com/uploads/1/3/6/0/136051235/jiputok.pdfIn PDF document text
    • https://puwakama.weebly.com/uploads/1/3/4/4/134474688/xodigabinofiko_lerusufonexi_rerogotikavo.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/w0mjhQz/espers_ff12_zodiac_age_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/5ZYEJhf/mad_day_2_shoot_the_aliens_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/ehaTwDi/toca_life_coloring_by_numbers.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/xewitasenesebugipa.pdfIn PDF document text
    • https://juwopumunas.weebly.com/uploads/1/3/4/0/134096214/7574762.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/aibgHYr/96019007259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a904a578-ec1e-4854-91d3-61a74b62bdbc/49260370225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03106d2-67fa-45dc-b5c1-8c051485375a/85277607080.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/fuvekefat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef72dc7-aa30-4de2-92ad-63bbc3da309a/mofes.pdfIn PDF document text
    • http://muwalolerede.epizy.com/65985498323.pdfIn PDF document text
    • http://barezidakoderop.epizy.com/gedurojululugapamosebev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 5232 bytes
SHA-256: d679dc6ccda3569c96dc6173f6b75359fd5ebf4c418e4ff4fe7c990e08f4f9ee
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11420 bytes
SHA-256: 24a6d7d239a524b2e907794f05760b3cb506a6d7b8da9dbf71bf432cd1b3052b
font_02_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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