Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba21edcbfce2953e…

MALICIOUS

PDF

80.9 KB Created: 2021-04-24 02:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bade0599125d6cf433037b80cdfa381 SHA-1: 8e39b5cadc74f285290576c177ff6573c49f3083 SHA-256: ba21edcbfce2953e948c2b9971039d5bf25ddc99fdd1cebc960452ef3f9df31d
164 Risk Score

Malware Insights

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

The PDF file contains a lure for 'free safety meeting downloads' and exhibits characteristics of a link farm, with numerous external PDF links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=free+safety+meeting+downloads
    • https://jubiwaxu.weebly.com/uploads/1/3/4/6/134645567/116280.pdf
    • https://nurufumetexode.weebly.com/uploads/1/3/5/3/135323779/1630346.pdf
    • https://cdn.sqhk.co/jabupexipa/gegeu0g/mxr_10_band_graphic_eq_settings.pdf
    • https://vixubarurumufov.weebly.com/uploads/1/3/1/4/131454397/wipajuko.pdf
    • https://cdn.sqhk.co/bitaxukezor/hWHGHja/free_domain_finder_tool.pdf
    • https://cdn.sqhk.co/tekunipifob/dBRIKij/hill_climb_racing_game_download_apk_uptodown.pdf
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/nomujito-pozuzowub-jusoto-safenulazeluna.pdf
    • https://cdn.sqhk.co/vafodagusun/idjjslY/nibug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/894ec639-acf4-41ce-b1f7-52c0b9f4c2f2/hp_motherboard_identifier.pdf
    • https://uploads.strikinglycdn.com/files/d3ea1ba4-778c-439b-948a-41c324027f4c/retiforazibotezen.pdf
    • http://mijugavagi.epizy.com/modelo_neoliberal_definicion.pdf
    • http://levaduru.epizy.com/31896452158.pdf
    • https://uploads.strikinglycdn.com/files/9a803e9d-4a06-431e-830c-ea17aa607f9c/58051651990.pdf
    • https://uploads.strikinglycdn.com/files/15e4270d-e384-4b2c-8c61-b1e9969b5058/guniranifovubasutotifati.pdf
    • https://uploads.strikinglycdn.com/files/44f60d81-9dd0-4a14-9123-063caa64a4ff/putapoxibovolatavidejes.pdf
    • https://uploads.strikinglycdn.com/files/84fc216f-d172-4980-98e6-0436cecce847/you_are_a_badass_everyday_free_download.pdf
    • https://uploads.strikinglycdn.com/files/0465a613-3b53-438d-8b88-cb2dc22dcb34/husqvarna_455_rancher_chainsaw_case.pdf
    • http://lojogonofar.rf.gd/78998206388.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_off0000ff75.bin
3393acbc4387d51ce8103b27b70bd6aed964b09830f7dcdc9ac38d18a9abd25e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 5376 bytes
font_01_sfnt_off000111c7.bin
b500dde3e14a3d460e71419b98e8c83e243a6515856e487b0fc375a7375a6511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 10800 bytes

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