Malicious PDF — malware analysis report

Static analysis result for SHA-256 17621b599c277ffc…

MALICIOUS

PDF

77.3 KB Created: 2021-03-24 05:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d84d2e269299d43dc51b53aa78a45ef SHA-1: ad0efd3f5f3e1a156fb2eb91dfcc1c97bc034c64 SHA-256: 17621b599c277ffc87284e78f9a4084a99265d7ac451cc029d9fca197bf7122b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files with numeric or generic slugs, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=international+journal+of+medical+research+%2526+health+sciences+abbreviation
    • https://cdn.sqhk.co/xasurila/hcjcidq/pujutukezal.pdf
    • https://cdn.sqhk.co/viwitukaz/8bFjh8X/ijazat_old_movie_songs_pagalworld.pdf
    • https://cdn.sqhk.co/gunonutib/fW9Vhag/78908088292.pdf
    • https://cdn.sqhk.co/kikutajaz/9jdLygi/53702377963.pdf
    • https://cdn.sqhk.co/dedogupazib/dic4ihb/wood_craft_sticks_walmart.pdf
    • https://cdn.sqhk.co/fepefudasor/agsg2gl/69123926841.pdf
    • http://myfirstsite.xyz/grammar_school_test_papers_with_answers1p9pk.pdf
    • http://gewututikame.getenjoyment.net/past_simple_tense_exercises_with_answers.pdf
    • http://datab.vip/xotaginh4am.pdf
    • https://cdn.sqhk.co/fitigeru/7g0jdji/27026821562.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumuzu/82688430313.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_c0bec22bbe9e4160855f3da2e1ee3eb1.pdf?index=true
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_0352069909924c858e5d37081b1fdbec.pdf?index=true
    • https://s3.amazonaws.com/gazijewevan/lcci_level_2_question_and_answer_2019.pdf
    • https://s3.amazonaws.com/jedobufudajewu/meramutejevuvarisurobus.pdf
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_59c5cb30d41f4c74aa37cadab95f81ea.pdf?index=true
    • https://s3.amazonaws.com/titugome/58452053908.pdf
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_e9f5e86f0be94baea4af70fdc21551fc.pdf?index=true
    • http://rinimodosejowuf.myartsonline.com/anatomia_microscopica_de_la_encia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed8.bin
bca82b7471463a9c0394866d67629590d2161ea9b45230378fa45141035cc79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 5276 bytes
font_01_sfnt_off0001009e.bin
6b8be18aa6b991e67e631547a15fb176eabb6ee40db184f111a0d32bdda9fe0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 11520 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.