Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e5754e0c0454c6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 19:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ddc0c411c5a04f779ea1e32b6b7ebe SHA-1: 2469b7b7d148be8b97ae16338bae79de9bd7942c SHA-256: 03e5754e0c0454c6ac661a2300012fe144d43ffed82ad773db7d2231591d833c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=first+aid+classic+wow+guide
    • http://nigasheff.xyz/62119789030x5ovn.pdf
    • http://pigigozoruda.mypressonline.com/pisinefaworizopepoga.pdf
    • https://cdn.sqhk.co/pifonode/iaRVXJ8/other_prop_hunt_maps_in_fortnite.pdf
    • http://luxuwum.mypressonline.com/1001_arabian_nights_full.pdf
    • http://kzrovk.xyz/sajufugodivozh9ab.pdf
    • http://sdek-24.cc/zibujorewafofiriq0w6y.pdf
    • http://bapatavusirave.mygamesonline.org/english_synonyms_and_antonyms_for_bank_exams.pdf
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fdff4b0b4b1a.pdf
    • https://cdn.sqhk.co/pigajifaw/mMgdjbo/epic_seven_wiki_sigret.pdf
    • http://naturfresh.space/76075943544q1ex5.pdf
    • http://osummer.space/95754162678ajvq8.pdf
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff5907cbf929.pdf
    • https://cdn-cms.f-static.net/uploads/4460457/normal_6021ce680a6f9.pdf
    • http://lnstgramhelpcopyright.com/lalitoxeb2ow.pdf
    • http://helplnstagramoffice.com/doveguvurolef8m7x.pdf
    • http://paselon.getenjoyment.net/zixonimedef.pdf
    • http://covid-19online.site/43586721186chxby.pdf
    • http://desokore.medianewsonline.com/kufizonizilaruji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://netomadutimafe.onlinewebshop.net/32999262495.pdf
    • http://nerezusilanake.atwebpages.com/inductive_reasoning_and_deductive_reasoning.pdf
    • http://fiforeru.atwebpages.com/learn_arabic_for_kids.pdf
    • http://kepawomokatuke.myartsonline.com/56164291306.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_off0000ff84.bin
6d8b3efe6900a8078c87558b078e569cb9b07c810ea2053b2d017d3b0a2e197f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 5156 bytes
font_01_sfnt_off0001112f.bin
6d3552f02af68d140420c7233c84bc479672d36fab88ed7d23a8516f9987ccc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 11320 bytes

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