Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6da10713a441da…

MALICIOUS

PDF

77.5 KB Created: 2021-04-28 22:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e760af0133ea0f230ad668891f4db285 SHA-1: 49c35d28e495611c50fc924fcb0b7bf059528f6c SHA-256: 7b6da10713a441da95d6d0abfede0cac21e45eb962b511ece32eb207e3d36965
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('pelibifir.ru') and flagged by heuristics as a link farm. ML classifiers and ClamAV also identified the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://pelibifir.ru/strik?utm_term=political+science%252Fpolitical+philosophy+%252848%2529+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486061/normal_602eb30b4adf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6058b88d5c572.pdfIn PDF document text
    • http://dokusamatofapig.iblogger.org/satekofekupikutubudovefur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_606392ce2aaa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd2fa604de72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_606e8ab5d5157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_60290098e76a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600bb6e91d057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojuzejuleg.rf.gd/lean_six_sigma_certification_online_india.pdfIn PDF document text
    • http://konazosite.epizy.com/vazisanerekazuzusokolal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3cb661-18e8-4e3b-89d4-142f72fb9e51/how_to_update_shimano_di2_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeef841d-7133-451d-af4c-61ef0053b16f/20003774179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8058de16-1bf6-4ebf-a159-a64d395f099d/best_way_to_build_magic_deck.pdfIn PDF document text
    • http://romevakamijoke.epizy.com/examples_of_solubility_answers.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/centralised_organisational_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9579f25-1c42-45e5-8fc5-d56f899013ea/how_to_pair_brookstone_earbuds.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/22754319792.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/trade_show_booth_layout_template.pdfIn PDF document text
    • http://tefalim.rf.gd/board_games_to_practice_english.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/love_warrior_book_review.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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 5596 bytes
SHA-256: 3e95be14b6f1347d0e6b6dfffdac1ba9e41530df24a2512faac19c858186b58b
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 10800 bytes
SHA-256: e6ef77bccd4fc51b9d109c5e765547679fec1f53e3c5ed4e1a115ac974704df1

Open this report in the interactive analyzer, or submit your own file for analysis.