Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dd02f4a8842f2a…

MALICIOUS

PDF

76.3 KB Created: 2021-02-22 04:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71281cdd158aa9cb24fa199958ef3a04 SHA-1: 23a7d2fe36d1a677a8b2bd4290e7630257ca1556 SHA-256: 28dd02f4a8842f2ae97a559f37f1a4911f47b979a94470f4bdb8d54fa3c1e7b2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a search result for vehicle repair information. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL likely leads to a second-stage payload, although the exact nature of the payload cannot be determined from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=2011+jeep+grand+cherokee+service+air+suspension+immediately In PDF document text
    • https://cdn.sqhk.co/vedimofaw/gijcuJ2/20374439445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6013bf53883c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_6022afaa534bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5ff90fea815e8.pdfIn PDF document text
    • http://azorocheat6.xyz/download_game_heroes_legend_idle_rpg_modb7jpm.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/ijfKoge/condado_beach_puerto_rico_homes_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5fc9ed6d9569a.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/c2aJFjQ/zojagipabunuxagawesijut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5fdfafc88d211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5ffad6b6c38a8.pdfIn PDF document text
    • http://verifybadgesbusiness.com/chrome_browser_for_android_2._3._6gn5hn.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/zjfjdjg/demolition_derby_near_me_october_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_601296b9c878f.pdfIn PDF document text
    • http://bigtittybella.com/hmrc_cumbernauld_vat_bank_detailsn1x7o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_5fff5eacd3cdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/noun_verb_adjective_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/wikerixawelis.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/o_saiyyan_agneepath_song_pagalworld.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 6020 bytes
SHA-256: abb04df19d0f4577fa0ea6593b8524986b2a70e2dbd986a03e86805856179574
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 10712 bytes
SHA-256: 3a35eb26ca7aaa77c1c4610f4ba13f6ece4e6f0060825f6f96c60b3213187bd1

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