Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37a3cf42db9c6f2…

MALICIOUS

PDF

80.8 KB Created: 2021-03-03 16:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8cce2e771732d58c29068a4d102fbe0 SHA-1: e0d49b001710c9ef72ae2fc919873dacb17eae62 SHA-256: a37a3cf42db9c6f25c01306685c5b538dd41345d446cfb84848cbd665545ca79
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high probability of malicious intent. It contains multiple embedded URLs, one of which is presented in the document body as a lure for a 'Steve Jobs biography book online'. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://dafemum.ru/123?utm_term=steve+jobs+biography+book+online
    • http://storeplus.info/premier_league_football_fixtures_release_datecrcsw.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_60357228e1442.pdf
    • http://usesalon.xyz/71570655644tbobi.pdf
    • https://cdn-cms.f-static.net/uploads/4388596/normal_603ab188f31d3.pdf
    • http://my-favshope.online/gijereramajkr7ik.pdf
    • http://keepmaxi.space/batangas_state_university_college_application_formg842v.pdf
    • http://drenajkrasnodar.ru/11901853853awpl7.pdf
    • http://bossyonlinex.com/letowifiwigifududurefi3dvqg.pdf
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5fe50da936499.pdf
    • https://cdn-cms.f-static.net/uploads/4486537/normal_5fd31a379bdf8.pdf
    • https://cdn.sqhk.co/xebibugekux/Sx60TbN/game_show_host_name_generator.pdf
    • https://static.s123-cdn-static.com/uploads/4406473/normal_6000bc7307811.pdf
    • https://cdn-cms.f-static.net/uploads/4471710/normal_5fd6ed667589d.pdf
    • https://cdn-cms.f-static.net/uploads/4469101/normal_6033ef73f0f1f.pdf
    • http://mx50off.info/net_framework_v4._03019_windows_7djp6e.pdf
    • http://idealslimitaly-ufficiale.site/zolufabuloxatexuzaretuddlxk.pdf
    • http://my-favshopg.online/momuzeworunuvevoria6o.pdf
    • http://ryursew.space/cryptarithmetic_multiplication_questions_and_answersqgmv2.pdf
    • https://static.s123-cdn-static.com/uploads/4415544/normal_600574f677a1e.pdf
    • https://cdn.sqhk.co/nibedogoxov/hfegeih/popular_hashtags_for_promotion.pdf
    • https://cdn.sqhk.co/tajavujexiz/gijrBhg/lataba.pdf
    • https://cdn.sqhk.co/vodadavubex/fFifhbM/everyday_thai_opening_hours.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fd82.bin
6ed87522d67349bf99faa7c60f264cb3b9c52550db28f7f2b2a1570f0bbcd015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 5628 bytes
font_01_sfnt_off000110ae.bin
832a0fdfc9659b72aa700809274b14e19f6bfc44871aaabd871e4b5fc6cc2e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 10936 bytes

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