Malicious PDF — malware analysis report

Static analysis result for SHA-256 998ba817fc3f3f5e…

MALICIOUS

PDF

94.2 KB Created: 2021-03-28 17:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f9efaf6216ad0d5d75d13117058fa8d SHA-1: d21c549ff7d21c2558d0d37109a95716544334d3 SHA-256: 998ba817fc3f3f5e0f75537fcf7fa4919571c4bdd43a682eb36bae91ef70c1aa
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 of which point to PDF files, suggesting a link farm or SEO abuse. 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 numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://soxebez.ru/aws?utm_term=how+many+steps+does+the+sdlc+have
    • http://kazonikaxa.22web.org/vidunev.pdf
    • http://bisibometixo.mywebcommunity.org/centriolos_funcion.pdf
    • http://zanapipok.getenjoyment.net/semuzofuzeseso.pdf
    • http://takipibimaxubov.sportsontheweb.net/best_reader_for_windows_10_laptop.pdf
    • http://mizarofu.22web.org/antecedentes_historicos_de_la_fisica.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wokakegefu.rf.gd/lenilazopaseketajafap.pdf
    • https://uploads.strikinglycdn.com/files/fdb5705b-2018-4fb7-961f-d911e5dd76ed/77269070043.pdf
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_31439b70d84e4fc09dd80e32c3b2a2fe.pdf?index=true
    • http://xukuwagozoli.epizy.com/cbse_guide_class_11_psychology_notes.pdf
    • https://uploads.strikinglycdn.com/files/d1864e16-2b23-41cc-ad4b-d2f4436be707/if_life_was_perfect_quotes.pdf
    • https://uploads.strikinglycdn.com/files/494da754-0f9e-4db6-93f5-a1cfbe997616/26460282671.pdf
    • http://temelozorijaxi.epizy.com/michael_swan_practical_english_usage.pdf
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_2289af649c814164a5851be1531a5775.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36e846da-a395-4222-8157-88ce788d4bb5/famirefefif.pdf
    • https://uploads.strikinglycdn.com/files/392babb0-3de2-4147-b1c4-45e13ee699bc/chapter_4_atomic_structure_guided_practice_problems_answers.pdf
    • https://uploads.strikinglycdn.com/files/28d230d6-0546-41c0-9d84-87df720d1c45/95184999029.pdf
    • https://uploads.strikinglycdn.com/files/778bbb91-10f7-4569-a5e7-f13990667475/73088815299.pdf
    • https://uploads.strikinglycdn.com/files/5c640ddf-a122-4693-bde8-ffa52279a19a/can_you_share_your_own_post_on_facebook.pdf
    • http://benamow.myartsonline.com/un_barrage_contre_le_pacifique_analyse.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_off00013446.bin
4327594b208e59e8c1b9b45e4027b557e138c7fbde3554add7081990387c9eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 5432 bytes
font_01_sfnt_off000146b5.bin
67586308ec979ec77b1f51d48aee4dcb42c7afb2c86e62e5a65f4b2283a7a785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 10876 bytes

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