Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bcca4122e880b8…

MALICIOUS

PDF

87.2 KB Created: 2021-04-14 14:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6feccbbc476f54c0ad7c8a19ae11464e SHA-1: 7139f54ca1945561e85e0bb8d4b8e5c070779364 SHA-256: c2bcca4122e880b8a4c950078c7a4b59da9de45bb9b7ca727fe0eb6cd9367512
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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/strik?utm_term=2004+ford+f350+service+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/zalenemu/hgMiije/suvebeguleto.pdfIn PDF document text
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/6567055.pdfIn PDF document text
    • https://mewerenazedesaf.weebly.com/uploads/1/3/4/8/134885553/vuzitemubaxiwetalus.pdfIn PDF document text
    • http://mifudubesesul.iblogger.org/46029720719.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuweduti/cDiaijL/42685844384.pdfIn PDF document text
    • https://padabomax.weebly.com/uploads/1/3/4/6/134681696/2934303.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/n6nZ4ba/46633407747.pdfIn PDF document text
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/malufosaxo.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/zesuvuluru.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/nyJbkgh/ted_lasso_trailer_music.pdfIn PDF document text
    • https://cdn.sqhk.co/rulopojuna/khajajb/36895811190.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/jghcxOb/spanish_to_english_translation_sentences.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/iBojg6F/commando_2_film_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/jht5jb0/wagozatud.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/zL1jgii/recargar_cubacel_desde_mexico.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/fixunofililapiner.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/jovusidusuwuj.pdfIn PDF document text
    • http://sepibuzare.22web.org/2017_cadillac_escalade_cue_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_036a0284d6a04fc99cd9e3d95946074b.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_65d03e8225084865bc4ad95f4a9973ea.pdf?index=trueIn PDF document text
    • http://levolavajoji.epizy.com/caloundra_state_high_school_uniform_policy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 5916 bytes
SHA-256: d181d92fe4c4f5d58909ed61d5cad911195b479dddf9d46f66d1b57df51cfe80
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 10664 bytes
SHA-256: f3460c033c8f20283be4a9eb5c57a1ab4f051e7a49d3420e1b7281a06a3248e4
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449