Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d728354ca8152dd…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 13:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 853883c34a503457cfe134de8bcf8f76 SHA-1: e331f7b05a0d450a1b689e814d1303896ed1795c SHA-256: 6d728354ca8152dd92ccb5c605447346ab17597b5184107d3f9d95b33fc56920
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the embedded URLs and heuristic firings point towards a malicious document designed to trick users into visiting compromised sites.

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://bologen.ru/wix?keyword=ps3+jailbreak+download+2020 PDF link annotation
    • http://bestunew.xyz/resident_evil_3_review_game_informer8hg30.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/iidgdIu/dungeons_and_dragons_character_sheet_3._5_editable.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/jiiaagf/marxism_vs_capitalism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_602a2ee9d742d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_601aa810a0bc2.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/hIqAVij/m416_gun_pubg_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/zewesifadeka/S8wqHjh/zovaguvinakarimaginoron.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/hanjclP/long_acrylic_nails_with_diamonds.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/Nbphijd/78975216475.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/ihi9jiZ/fepodepozizogoxajabe.pdfIn PDF document text
    • http://cmb-societe.com/39477716650hzliq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fdf277f26cf4.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/jibieKq/monster_truck_stunts_driving_simulator_mod_apk.pdfIn PDF document text
    • http://natorg.fun/fereveramefisubuwawin8qa8f.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/thjEidm/santorini_greece_vacations_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/jijbjaE/idle_coffee_corp_new_locations.pdfIn PDF document text
    • http://prostosite.site/5011455898940eg0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizadopozi.epizy.com/beechcraft_duchess_76_performance.pdfIn 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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5632 bytes
SHA-256: 6cf546ff2966b3574d6ceb82a369219d29bb5a5c5504ed1dc7c99d4cd0562968
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10136 bytes
SHA-256: aaa1a6ea65ba560681e1e2a7ce813eb6b79c1eec33820168fe2839c93439c103

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