Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caf34568a279a8a…

MALICIOUS

PDF

67.4 KB Created: 2021-03-02 02:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf009b17d10d9b8c35d981d72fb9705 SHA-1: 385d34f0063d8414a37853b0a5491b785b6e5594 SHA-256: 5caf34568a279a8a75f69ba77757daaf0975273edd0c78d43e3ee7bcfa90a1ad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=what+if+pure+flix+full+movie
    • http://successinyourlif.website/craftsman_1_2_hp_garage_door_opener_gear_kitn2nz6.pdf
    • http://fakixigulidol.mywebcommunity.org/difference_between_virus_and_bacterial_cough.pdf
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/52f87bc.pdf
    • http://medicinfo.online/prosperity_party_ethiopiadplxv.pdf
    • http://mybestchan.online/himno_a_telesecundarias_del_estado_dm28j3.pdf
    • http://salonvarna.com/run_shortcut_applehbaaz.pdf
    • http://feedbacrnz.space/53749518233a3ski.pdf
    • http://wonozudobitisog.scienceontheweb.net/26850391947.pdf
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/98dcba3fcf420.pdf
    • http://ecoservice-vlad.ru/8664318473g6nqq.pdf
    • https://resezavurafufok.weebly.com/uploads/1/3/1/4/131407395/pogimexukitesuko.pdf
    • http://veruvipavopa.getenjoyment.net/numakazogubusotimovujetif.pdf
    • http://1cats.space/vejifojemulotaveteru7rbku.pdf
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/samexisapena.pdf
    • http://kino-vezde.ru/how_to_pray_for_a_cheating_spouse3pvcw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://beverotunege.epizy.com/binary_code_numbers.pdf
    • http://dojidusajotat.epizy.com/california_consumer_privacy_act_2020.pdf
    • http://dijutago.rf.gd/how_did_the_great_awakening_affect_the_colonies.pdf
    • http://dagajevefud.epizy.com/furupakov.pdf
    • https://s3.amazonaws.com/laginekux/77044190403.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_off0000c9f7.bin
0e7bbbc05eb1ce5e20a32f4f93e5b435f4f0b71b8aa468bd6ddb6690658b7f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 5104 bytes
font_01_sfnt_off0000db42.bin
2cf7be4fe838a85397dfe904a58ed66fe7a95a1f877e98d1e0871c8fc941d522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB42 10852 bytes

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