Malicious PDF — malware analysis report

Static analysis result for SHA-256 b920cca7d9116d1a…

MALICIOUS

PDF

77.8 KB Created: 2021-01-24 19:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bbe1b0de48164d81f665843cf88d92a2 SHA-1: b2935b18cc164cd430553b3e005b4647bc9d419d SHA-256: b920cca7d9116d1a453a90d2be52c51344ae5665b0a2ea02e53f591e34109852
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or redirection scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely related to phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffi.ru/wb?keyword=pirate%20ship%20crafts%20for%20toddlers PDF link annotation
    • https://cdn.sqhk.co/poxudanefisi/hibgjjZ/lakolufuxalomagew.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/tevulifefidero.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/kaxumezoja.pdfIn PDF document text
    • http://zubosoxi.22web.org/afara_e_frig_song_pagalworld.pdfIn PDF document text
    • http://didanak.22web.org/sibavidarawafalifex.pdfIn PDF document text
    • https://fusewexe.weebly.com/uploads/1/3/2/7/132712136/590231f.pdfIn PDF document text
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/vupun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5fd12e63348c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivowotow.epizy.com/an_american_tail_full_movie.pdfIn PDF document text
    • http://vimabamavarona.epizy.com/free_html5_coming_soon_template.pdfIn PDF document text
    • http://pajilovusibu.epizy.com/gipemajerigigib.pdfIn PDF document text
    • http://nifukugobu.rf.gd/37063795999.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/snowbasin_weather_report.pdfIn PDF document text
    • http://wanedinak.epizy.com/65692640903.pdfIn PDF document text
    • http://bavajozobe.epizy.com/dekezogozizisogedisadelap.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 5244 bytes
SHA-256: 39db68fcc275e9eaacfa337465dd9c9c771bfb136c2006255c438ad05eea0395
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10948 bytes
SHA-256: a69229fb2393b6233116e161737f480af2725e795290e2997e2dcc2377dd42e9

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