Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad57ca96cec39b2…

MALICIOUS

PDF

65.3 KB Created: 2021-02-13 08:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9889cd7c042328a40d689f8a1d0c6d7c SHA-1: 37c5abddee6a79c90cc38271e24f03cad280b5b7 SHA-256: 3ad57ca96cec39b288397b1725db9557cc58d38da36b65a321777c089e424ec4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/aws?utm_term=adobe+animate+cc+banner+templates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384655/normal_6004bfa71880a.pdfIn PDF document text
    • http://iciapp.xyz/7426589764izmo7.pdfIn PDF document text
    • http://dayzcommunity.info/ctopp-2_examiners_manualkfg9g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_5fd72e61a7515.pdfIn PDF document text
    • http://wppremium.org/movie_manager_for_maczetsj.pdfIn PDF document text
    • http://igbusinessabouthelp.com/cheran_cholan_pandiyan_movie_songs_freej8mnm.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/igjdGii/back_wars_mod_apk_download_for_android.pdfIn PDF document text
    • http://naturwows.space/viridian_forest_maze_map_pokemon_revolutionv70mx.pdfIn PDF document text
    • http://khareedforosh.com/fonofotekiworawiravoxasl4acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_6006141fd16e1.pdfIn PDF document text
    • http://garant-ritual.online/kenatofanitagiyxm8i.pdfIn PDF document text
    • http://instapodarok.site/benevolent_fund_kpk_loan_formqlkd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_5fe78f3e64a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_5fdf77ea40464.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/vida_eitleri_nelerdir0v8yj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_60078a63c7e8f.pdfIn PDF document text
    • http://pelistens.xyz/shellac_nails_near_me_open_sundayitf4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 5348 bytes
SHA-256: 5fdc7946737a3f1ff1af02b8ce2e98f71bc01c116bf02b558b4738b069df990c
font_01_sfnt_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 10980 bytes
SHA-256: 5b9dfc7002e4cf60517ef1b8b94183e8037c9c4436af485a4de44ae1c2867505