Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f704628fa45f129…

MALICIOUS

PDF

61.3 KB Created: 2021-02-13 18:29:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e9c4049798a218fa39bd900de32759a1 SHA-1: d2f6e0977b4f203502237512f74d4150cda25caf SHA-256: 0f704628fa45f129180aebb3a6e9c05431420ce96f2e062e690b07b1ae5900de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract search engine traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=rwby+after+the+fall+pdf+free PDF link annotation
    • http://jixuvofariva.iblogger.org/south_park_the_stick_of_truth.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/mgg6Fhe/anime_battle_simulator_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ThhOOLJ/speedy_cash_advance_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/fNrJMij/39283157681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_5fd1f9d5edf5e.pdfIn PDF document text
    • http://menawamuno.iblogger.org/excellent_cover_letter_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/iihjgdt/monkey_preschool_lunchbox_app_ipad.pdfIn PDF document text
    • http://jejepofat.22web.org/spooky_scary_skeletons_sheet_music_viola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedikofip.rf.gd/wododofugebakutar.pdfIn PDF document text
    • http://badavusepewojo.epizy.com/poster_design_word_template.pdfIn PDF document text
    • http://zuzofigub.rf.gd/android_secret_dialer_codes_list.pdfIn PDF document text
    • http://sidegiri.epizy.com/54963237434.pdfIn PDF document text
    • https://medlineplus.gov/falls.htmlIn 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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 5292 bytes
SHA-256: d99e3558b6a209be2eb3584363679370e9329bbf1e9517586c0dd8f8e97a4dd8
font_01_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 9116 bytes
SHA-256: 5d75f6a32f65841ff2ef2ac52915e88ab761f551ac3ce9175d6eff287c458e49

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