Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec504ea92cd54c3…

MALICIOUS

PDF

67.3 KB Created: 2020-12-14 02:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 28a69c80ebe4054b152137c891fdbf94 SHA-1: e014b209baf0e5c9f8bc59802eb92d238c64fbba SHA-256: eec504ea92cd54c3c1d20db307bfeb156a4cd55505e4d4d8531ca1a4b478cf01
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One URL, https://traffset.ru/strik?utm_term=cotton+candy+nails+with+glitter, is directly embedded, and the PDF structure indicates it's designed to host numerous links to other PDFs. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature, likely for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://traffset.ru/strik?utm_term=cotton+candy+nails+with+glitter PDF link annotation
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/2245cec628.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/nozeluxotedi.pdfIn PDF document text
    • https://toguxiwo.weebly.com/uploads/1/3/4/6/134645105/9269360.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/wowikasekuxul_tusesow_wibepoxuwa.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/d567f2.pdfIn PDF document text
    • https://kewidavarij.weebly.com/uploads/1/3/4/6/134696647/626f833da71b.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/pogowoxazavuva_komanisikeg_wopuv.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/3055502.pdfIn PDF document text
    • https://fexejazawipezes.weebly.com/uploads/1/3/4/8/134869354/vetizeg.pdfIn PDF document text
    • https://rafunegax.weebly.com/uploads/1/3/4/3/134350232/makokisizim-bidemar-gipepewibugo.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9653445.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/rabematavizebin.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/voropa/sam_rayburn_fishing_guide.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_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 5300 bytes
SHA-256: a5174735e811fb470bb6bf461a739b61c0f81fc29465e0d3110e464cbd8eaef1
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 11232 bytes
SHA-256: 0120c1cbc97209ee5336ad2293ef23494d43c52e94f771a54cdaaea5418f8856

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