Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c01c8626635e3e8…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 02:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f15a75c40accf466f95736f784f07e77 SHA-1: 56947ff93e855557113adb79609588ab2c38f6fa SHA-256: 0c01c8626635e3e8edaededdc50484bbba7866561d2201c997a834fc196c0bbf
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to drive traffic or distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=free+blank+brochure+templates+for+word PDF link annotation
    • https://cdn.sqhk.co/duvetezoje/hh0ihGv/skip_bo_directions.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/pamadim.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/pizetelaxakozodemibasaga.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/gjgCgfp/40337307874.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/henhijf/exploration_definition_deutsch.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/dukexajuj/kaththi_sandai_songs_free_masstamilan.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_7e432d4d78614901be5e349239f3221b.pdf?index=trueIn PDF document text
    • http://wifudozakiteg.epizy.com/baishe_srabon_movie_songs_320kbps.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_37eea45965f745b5a66680fcc7064ea5.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_f22d880e4d804fb3a94bcaead2913277.pdf?index=trueIn PDF document text
    • https://c75ed97e-f406-4d79-b864-c99612e64be8.filesusr.com/ugd/a66d15_0d0f386f2419417ea8b11d0cf61a302c.pdf?index=trueIn PDF document text
    • http://kubudafexajik.rf.gd/volesupofanakipu.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_231788acf4a948de8e8f63a285b16aac.pdf?index=trueIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_2cc1893272404be7946955f8a21a13cc.pdf?index=trueIn PDF document text
    • http://winexuxipowef.epizy.com/bluedio_headset_manual.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_ff4a33dbdf70445e9069a586baacc1a3.pdf?index=trueIn PDF document text
    • http://nabafutig.myartsonline.com/mtd_yard_machine_riding_lawn_mower_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/how_to_eat_asparagus_fine_dining.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_66811b2f57eb4aa2ba540f4d7e0643f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/53674198057.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_d24591930a8a484dbb140245dad6843c.pdf?index=trueIn 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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 5644 bytes
SHA-256: dda0422c82f842a6af485b323d2ef8859daa9a677aeb83db34fc8153b1deed0c
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 10252 bytes
SHA-256: 014d0bc336b8522e406b28267b13ac40803c4851dcbb9d7d9b7de48dd4772de7