Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58c897371b3137a…

MALICIOUS

PDF

70.6 KB Created: 2021-02-06 20:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae0d10ba714ea592ffae402b7f83f86a SHA-1: 0ac8b924e2f4c90890ee59b7f5dd60a3e89c4ce2 SHA-256: d58c897371b3137a508e5c3ba51c44dab327b43b6bc7cad6f0c70830e72968e3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://bologen.ru/wb?keyword=advent%20calendar%20template%20photoshop PDF link annotation
    • https://cdn.sqhk.co/dulinifijal/FVehbdE/the_maze_runner_original_book_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/nghgTge/shadow_fight_3_nekki_play_online.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/5186486.pdfIn PDF document text
    • http://mbfsopg.com/jojo_guide_to_the_sweet_life_bookcbd42.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ibCTdHK/3358582456.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ichklW1/32006911693.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/bUibOhe/74419305438.pdfIn PDF document text
    • http://constructionhouse.info/28140976032nahch.pdfIn PDF document text
    • http://tumbochka.space/jikiwebefugogufelezanulod9af.pdfIn PDF document text
    • http://doctora.club/safifowazujufonefufc9d1l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobagelamabix.rf.gd/lamborghini_song_diljit_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/40327747822.pdfIn PDF document text
    • http://banolepepo.epizy.com/gengar_solo_raid_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/kitibaxosax.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/66921978364.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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 5364 bytes
SHA-256: 93958ce9da26d83caa57d74d81049787ee787dfe6a605977cb275b32a81fd4e0
font_01_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 10780 bytes
SHA-256: 1f8279d53afa29cd944843a0211d718c43d1fce14e34090811ee8e182f02951d

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