Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8943cf72c546fb…

MALICIOUS

PDF

68.5 KB Created: 2021-03-09 12:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328a66d5cab2d3506cee7be53277a2d4 SHA-1: 70c1cd4f56367c09a7dc0667f19e7855ff04418e SHA-256: 0c8943cf72c546fbfc2599f8d1f4b0708222b943373d1a1dc22b3784d122adaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host numerous URLs, potentially for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=hunter+college+fall+2017+calendar
    • https://cdn.sqhk.co/duwenaxiseve/jejcXhe/zedorugut.pdf
    • https://cdn.sqhk.co/nonuripot/e5heehg/74928313430.pdf
    • http://xojuxelase.medianewsonline.com/what_are_three_biotic_factors_in_a_grassland_ecosystem.pdf
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/moziwodolamudekele.pdf
    • https://cdn.sqhk.co/goxoxasopus/hjjgcgf/super_adventure_rockman_english_patch.pdf
    • http://suxoxaxowigab.scienceontheweb.net/rx_v373_specs.pdf
    • https://nuzalegexokoz.weebly.com/uploads/1/3/0/8/130814177/381f38f90b6c420.pdf
    • https://dipedupaketi.weebly.com/uploads/1/3/4/3/134333799/virunaridonodedefi.pdf
    • https://cdn.sqhk.co/vasozaponem/gcEBgjl/19319462908.pdf
    • https://cdn.sqhk.co/vakanaju/W60jbaS/carrie_underwood_cry_pretty_tour_songs_list.pdf
    • https://cdn.sqhk.co/fesakesovoka/hdghge8/85811148558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujixus/99194755168.pdf
    • https://s3.amazonaws.com/gasodamuza/nezaruvawena.pdf
    • https://s3.amazonaws.com/pevarijidasalop/96132956971.pdf
    • https://s3.amazonaws.com/retisovojor/43493293853.pdf
    • https://s3.amazonaws.com/libowebujakux/40324499308.pdf
    • https://s3.amazonaws.com/bojafazes/energy_drink_market_in_india.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/tidifipizoreviwixo.pdf
    • https://s3.amazonaws.com/jenagubadopi/budosewejatowazefaralevi.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_off0000ceed.bin
95a9e2630228a675b581058508d6776dc3b19371d7a0d818fa56e5e2cf1b87a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 5376 bytes
font_01_sfnt_off0000e14e.bin
087e59aaaf805db3d49303d2666533cf326e7489dafe01cf50fc24d60e2eb39d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 10396 bytes