Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedb914151b3ff33…

MALICIOUS

PDF

70.3 KB Created: 2021-02-21 16:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2f16ff74fc2c9c51860abfa2688378bf SHA-1: ceb4aeca45c69b0221857cee436ef0b7d7fb78e7 SHA-256: fedb914151b3ff3376c84dd3cb2a44b3b4abde9a344e0903acc88b414c67c848
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to phishing or malware-hosting sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=3d+geography+crossword+answers In PDF document text
    • https://cdn.sqhk.co/jixuvepabu/nD1ji7j/vakurenuvukamutaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/ydhc8xT/zuzogalubasazuzegaloluko.pdfIn PDF document text
    • http://poxijirubulemax.22web.org/bethune_college_admission_form_2019_merit_list.pdfIn PDF document text
    • http://universe1.space/gedasijepodonujozuruvuxo6jyvt.pdfIn PDF document text
    • http://nature-ital.space/jixefiwug7z93.pdfIn PDF document text
    • http://bluhgang.best/believer_imagine_dragons_video_songt4w2k.pdfIn PDF document text
    • https://cdn.sqhk.co/kubarevopew/hDnjjgh/pepedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415748/normal_5ffda83dc92e3.pdfIn PDF document text
    • http://helplnstagram-confirm.com/alter_ego_plus_b1_freexkojn.pdfIn PDF document text
    • http://misstourist.info/simonton_daylight_max_reviewsobkfz.pdfIn PDF document text
    • https://cdn.sqhk.co/bejazerorod/Yb4mlDo/waqt_the_race_against_time_movie_download_480p.pdfIn PDF document text
    • http://emmetrix.net/borderlands_3_legendary_list_spreadsheetjqh00.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://s3.amazonaws.com/godoremitiwuja/43568770138.pdfIn PDF document text
    • http://velumosak.epizy.com/muvodidowuwukoduvipeji.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/11794729315.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/29188134686.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_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 5228 bytes
SHA-256: 7a7b613a6775c804efd2d27ed5301d5596e65b0a86d7d03c055c0224666ea484
font_01_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 10484 bytes
SHA-256: b9b33d2996da95a08891e5e5b9789a14143b9c0e6ec8ba0ea36ac82572219662
font_02_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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