Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b795d2d914d3832…

MALICIOUS

PDF

78.2 KB Created: 2020-12-24 00:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff0b20d0ada8fd1341497de4ee5b3f67 SHA-1: 66b74deb0d7ec9e0534b8cd9d2f551985e91ab21 SHA-256: 3b795d2d914d3832f043ed46c30035873708b8f7ce888294ed2cd2cbf0461480
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://traffine.ru/strik?utm_term=plant+diary+pdf PDF link annotation
    • https://vubosetupis.weebly.com/uploads/1/3/4/5/134594606/gakojalera.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/9544597.pdfIn PDF document text
    • https://bowulotufevep.weebly.com/uploads/1/3/4/5/134595608/xofakirotajusakafe.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/7386287.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/sajufinabuju_donowop.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/8108410.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/ginutu/greenhouse_effect_gizmo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/chemistry_lab_manual_timberlake_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/boogie_woogie_blues_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/zomeridemarafu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 4960 bytes
SHA-256: 510c43fc91c5ecfec511a482bc193950944a68978a4e10499a4d379630228582
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 11168 bytes
SHA-256: 0343b4f7299383214d616f27bbc89451f2d251b59ba499e3847bf1feec9ae5dc