Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff0e0b739ef8c8a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 07:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a594c4d724783ddbe72defe0889d1642 SHA-1: bbbc098f73531ca64a259ab4d6ef85d6c0e7b438 SHA-256: bff0e0b739ef8c8a047830de75d24f2025e538c2fbcf38fbb40d28fc4ae52a51
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to university rankings, which is a common tactic for phishing or malware distribution. The presence of multiple links on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/award?keyword=world+university+ranking+2020+pdf In PDF document text
    • http://rabejagoruwobol.66ghz.com/nuovo_cinema_paradiso_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_60017393f287c.pdfIn PDF document text
    • http://vukuwupevipe.iblogger.org/12652620054.pdfIn PDF document text
    • http://kemavipamu.iblogger.org/42415346481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_605b0f3579690.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/dikemafin2bk7s.pdfIn PDF document text
    • http://xazerakovewule.22web.org/vaaste_song_dj_remix.pdfIn PDF document text
    • http://badge-verification-center.com/floodplain_management_in_australia_best_practice_guidelinesg995a.pdfIn PDF document text
    • http://free-at.pro/5347846377482a6d.pdfIn PDF document text
    • http://gododerur.66ghz.com/niwizipidipeju.pdfIn PDF document text
    • http://submonster.xyz/dvd_ram_driverf9ozo.pdfIn PDF document text
    • http://floradoma.net/don_conrado_sol64jeh.pdfIn PDF document text
    • http://sodaapp.club/simplehuman_soap_dispenser_wont_turn_onfgnpr.pdfIn PDF document text
    • http://itchia.space/figure_drawing_for_fashion_designs5xq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_60380906b4643.pdfIn PDF document text
    • http://finansi-7.online/17376888309ze2cg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifabopopotesa.epizy.com/66963620863.pdfIn PDF document text
    • http://vitafunajubala.rf.gd/saucony_everun_guide_10_dames.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_5a4d31111fc84af9bb74188f7b738760.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_74dd2a12dd0f48a8bb4262d0ab5844f7.pdf?index=trueIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_e6074d432a7d4fe686a3c7ad18de444b.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_76b10bbc0afc4329bf2e736d6583429b.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_9dcf58d1b42541a1a992b83f3c1cc54b.pdf?index=trueIn PDF document text
    • http://marivugedada.epizy.com/zilurikuwak.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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 5720 bytes
SHA-256: 1cd178df7c55dfb56eb9ff263b827003e93288b5871d19446e01c7e5251e3cdc
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10832 bytes
SHA-256: a6310c334d207169222881d1b6f452a9568af8eeeae664a7982cb98834fe3b1b