Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8542c1f9582a2e1…

MALICIOUS

PDF

93.6 KB Created: 2021-02-23 15:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f2ced395072e8bb24bf2129edb3da3b2 SHA-1: f0beb64c4325a354f54ec69764b18c601c8c8237 SHA-256: b8542c1f9582a2e1524bb0278205b1d25e7e0cbb8d5b2201b2f8c1f3b5aa3cf1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable domains and link farms, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jottigo.ru/strik?utm_term=relax+into+stretch+dvd PDF link annotation
    • http://www-sfr-fr-monespace.com/arua_chaula_duba_video_song5c6pa.pdfIn PDF document text
    • http://reduslim-europa.site/1997_ford_f350_work_truckzjc0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5feb94863eed1.pdfIn PDF document text
    • http://fitokapss.xyz/brain_food_lisa_mosconijkgmg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5feb95203e8d5.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/UgjNkhi/movies_2020_out_now_on_dvd.pdfIn PDF document text
    • http://avto-trokot.xyz/kodojaex4jz.pdfIn PDF document text
    • http://pl50off.info/542591559670rey4.pdfIn PDF document text
    • http://weinmvc.net/ruxox1j2fw.pdfIn PDF document text
    • http://beautysss.site/la_soledad_de_un_cuerpo_acostumbrado_a_la_herida_poemasdd8c6.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/mChcjjl/61043168003.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunivugame/5hewThc/grid_drawing_pixel_art_pro_apk.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/juliziwojatige/86047257828.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 5160 bytes
SHA-256: 153e30fb233880f48b96e9833f3e8af45e5db8953a644db9345629ca9ce72154
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 9404 bytes
SHA-256: e6dce8909a1aba900c4a7cf8bc39ed562d722773886290c44ed2a7acab1c699f
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 11776 bytes
SHA-256: 4916c90b12ec63131154afeef243768dc336d94ae292eac66febde338f24550e
font_03_sfnt_off0001511f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511F 16912 bytes
SHA-256: fbf3004dbe453c582c3083f840773719c89ca9747631807dceae5a333945362c

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