Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dccf0116b6f972…

MALICIOUS

PDF

74.4 KB Created: 2020-11-11 21:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e15fa6066df010f007396d8495cbb893 SHA-1: 92529cad38b760116f776e6917f2a62d4d759492 SHA-256: 21dccf0116b6f972aa5361705ee5daf6a8c7361216fcf5213a8f85b6aa900d99
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=meat+smoking+temp+guide PDF link annotation
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/ravaxozog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f974865e4fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f9248237d43b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f91ea17d2299.pdfIn PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/4a6e2a5e07c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulozor/porch_bandit_protection.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/analog_and_digital_communication_schaum_series.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/puvasevoju.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/7842026735.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/46156329468.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/holly_glover_wichita.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 5104 bytes
SHA-256: 26db6d25115f71033c81daad68be9f6c2e19acd0ad382e90b27375a82eaa3db4
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 11096 bytes
SHA-256: ecbecfba7f6e8beadaa115905802b23898adde1f4ee145b9878e37b0df387daa
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2