Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c518550885b3036…

MALICIOUS

PDF

70.8 KB Created: 2020-11-10 11:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0647fedec7ab6567194f06740e48dca SHA-1: 7cb96d891a5e522b129f5346a608cdf3313436dc SHA-256: 9c518550885b3036bca38d644e0a5ce6fbe602ff9cc45acadcb26b191f8f0156
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 30 external PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to serve a second-stage payload.

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://trafffe.ru/123?keyword=swtor+reputation+guide
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/vefanojenilekef-tezit-juterul.pdf
    • https://folesatabija.weebly.com/uploads/1/3/4/4/134441350/jixamomipuzazir_kuguzorulapak.pdf
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/sijikilomarejuxasib.pdf
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/203562.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/8963941.pdf
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/weponuvetanugeb-fonufaguki.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/7376adbed2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rowubunak/kepuzulo.pdf
    • https://s3.amazonaws.com/pirosisob/path_analysis_and_sem.pdf
    • https://s3.amazonaws.com/gatiwaraluva/conan_exiles_journey_guide.pdf
    • https://s3.amazonaws.com/wexukufedepim/34155089035.pdf
    • https://uploads.strikinglycdn.com/files/1af8b6a9-3fb6-4b49-b793-d6dc9b54ccf2/18972587432.pdf
    • https://s3.amazonaws.com/pomaxa/72446392903.pdf
    • https://s3.amazonaws.com/safago/la_clase_plural_form.pdf
    • https://s3.amazonaws.com/sojuravewi/the_48_laws_of_power_epub_download.pdf
    • https://s3.amazonaws.com/zirojopemup/bimofenemepixibu.pdf
    • https://s3.amazonaws.com/baxekojojexusol/hyde_park_management_llc.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_off0000d74b.bin
c7283d842e35644baf3f2ffcfb9fed8c1d317ac7eb16dfe52efe51a6cd6d3a8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 5112 bytes
font_01_sfnt_off0000e8d0.bin
127f2def4446b4191fd972f906f499182de529ca0b16701df2cbf26f9871a35c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 11344 bytes