Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cdb09e7ce9a1a7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-22 20:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf7253bc0fb75bdf5ba307ad974ef0f SHA-1: d5498912c7ccd52d18d8afb99601c5b156e804c8 SHA-256: f4cdb09e7ce9a1a7707949e4c0c6c766d417f7fe839b5d349f6e348862fc96d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF contains numerous external links, with one specifically pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are likely malicious or part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=analytical+methods+in+biochemistry+pdf
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/jasupofotil_lavinubigeruke_gixaxoxenojuz.pdf
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/2992311.pdf
    • http://pozijuza.scienceontheweb.net/42844443247.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aae92fe1-016d-42bd-ae19-33c39eb58c96/mugujevelewagovesowux.pdf
    • https://s3.amazonaws.com/sasufufa/20965308346.pdf
    • http://gozidonozali.myartsonline.com/bangla_to_english_vocabulary.pdf
    • https://s3.amazonaws.com/pobixedele/suvozudemunon.pdf
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_afb6f2895b5d474d8eb7d070b6b0ff38.pdf?index=true
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_cfc313e92c1846b7a88cf744283fcfcb.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_69c3adc1392c44a5803e797bdd28d496.pdf?index=true
    • https://uploads.strikinglycdn.com/files/799cf5f6-4fa2-4006-b5ba-d045482ffb44/56365670002.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e17b803e3c4f437fba98e6d1d0f7df24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d26b8e8-2d3d-426b-bd15-b8cae7af4315/32672273726.pdf
    • http://rosajeku.myartsonline.com/the_human_body_systems.pdf
    • https://uploads.strikinglycdn.com/files/6da526ef-6bf3-4125-85fd-fdb413fee048/34027229396.pdf
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_37144e056764495bac91394d898d4f24.pdf?index=true
    • https://s3.amazonaws.com/xirixepo/vlookup_google_sheets_different_tab.pdf
    • https://uploads.strikinglycdn.com/files/52d60d75-7cd7-4a7a-8aa9-8effabdb035e/bunexoresobogi.pdf
    • https://uploads.strikinglycdn.com/files/9e536ad5-e614-4916-9de4-867469bdd828/is_boy_in_striped_pyjamas_true_story.pdf
    • http://fuvuxejuv.myartsonline.com/building_automation_and_control_systems.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/47788882697.pdf
    • https://uploads.strikinglycdn.com/files/978af9da-986e-4cb1-b548-e61cbef9b13f/windows_codes_for_french_accents.pdf
    • https://uploads.strikinglycdn.com/files/99a691b5-aea0-4e0b-862d-32cf663f955c/big_little_lies_season_1_trailer_song.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f080.bin
6690d78c017a27c8676bba46b9df8e274f7669268a34791bcb1c9e8de1280bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 5628 bytes
font_01_sfnt_off00010378.bin
6a503aedfc534c961d403f93e1d8c742db59cf39f139c29b4c9db982a13f2fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 11484 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.