Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d57794865a538a…

MALICIOUS

PDF

67.6 KB Created: 2021-01-15 00:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dbb1cdba1b9a3356ed079ee4e6a48f87 SHA-1: cc732c1d7d33a00700f7d4e33e87772f6ac9d1d3 SHA-256: 82d57794865a538a13c365f344b456c1291945d555d0fb07a19b24517a6177a0
124 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host multiple links, with one prominent URL pointing to 'trafffe.ru'. This indicates a likely phishing or malware distribution attempt, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7649

Heuristics 4

  • 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
  • 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/aws?utm_term=space+dandy+ost+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484118/normal_5fba176ced2d5.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/makerbot_method_user_manual.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/nipadupipisixul.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/5071298.pdfIn PDF document text
    • https://site-1178035.mozfiles.com/files/1178035/88296680577.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/547178.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/1159488.pdfIn PDF document text
    • https://manasuma.weebly.com/uploads/1/3/0/8/130873954/87222115bbf.pdfIn PDF document text
    • https://site-1179462.mozfiles.com/files/1179462/minecraft_mod_1__7_10_world_war_2.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/wovisak/answers_for_level_1_antiterrorism_awareness_training.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/52845464057.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/bcmon_apk_v2._0._1.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/95339893212.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/danubasusokipuke.pdfIn 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_off0000c5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CA 15456 bytes
SHA-256: 3b0038ad686a7354d69c6b32449947de8c62a491e7abb4f2129e04ca46ae89b4
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 5196 bytes
SHA-256: 2ecd45b084a0ad3c0c371b01a6556f7df858e710f0e1d7a15283be2d96f0e292