Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d910c9d5e3bfded…

MALICIOUS

PDF

73.7 KB Created: 2021-02-27 12:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 218dffd303fa1321b292b3279e7ba0e8 SHA-1: 0d4efcb9173980da270d840051a9ed1310b4159d SHA-256: 0d910c9d5e3bfded9966abea68fe8439fc5fa1b3d2adb766a66c86fe36746729
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to university degrees, suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further payload delivery.

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/aws?utm_term=information+technology+degree+in+university+of+moratuwa In PDF document text
    • https://cdn.sqhk.co/tononapiwaso/zgGKhjd/81350026267.pdfIn PDF document text
    • https://dijozigi.weebly.com/uploads/1/3/4/7/134748041/859f24.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/5eiiehe/zadelobifosemu.pdfIn PDF document text
    • https://renijekut.weebly.com/uploads/1/3/4/3/134306869/zugamiw.pdfIn PDF document text
    • http://newberginvestmentproperty.com/612528656900o7hh.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/41862526173.pdfIn PDF document text
    • http://lastmarkt.ru/stylish_fonts_for_logoelysc.pdfIn PDF document text
    • http://recepty-dd.info/are_grapes_good_for_cancerpmy8p.pdfIn PDF document text
    • http://cardioactiveufficiale.site/remington_700_sps_tactical_stock_modificationbd58r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nexuvojof.epizy.com/24435719883.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/capture_one_version_8.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/english_grammar_worksheets_for_grade_2.pdfIn PDF document text
    • http://liwukoxobumex.rf.gd/non_spore_forming_bacillus.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/gunopa.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/povasidi.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/remington_14_limb_n_trim_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/berozamujaxakidefovojej.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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 5624 bytes
SHA-256: 82a02d65b003e8ab8127110be82ccb77059797416c8af20e47548f4618096135
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 11500 bytes
SHA-256: 043b1e65cb723747fac2907c6db7702d121f3bbcf9940ef87d4007d44de78a1a

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