Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f3f0d2c4259a26…

MALICIOUS

PDF

76.0 KB Created: 2021-01-12 10:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cb62336c2a6242601e99c368ab4f0cc4 SHA-1: e2013334a9f0f9ddd7ca10d380dab269e06e6561 SHA-256: 53f3f0d2c4259a266e26c20b4743473ae2d9b05d7fc338411e66852de9616613
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are linked to disposable hosting services and utilize UTM parameters, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted software. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious 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://traffine.ru/123?utm_term=clash+of+clans+red+apk+free+download PDF link annotation
    • https://cdn.sqhk.co/rolidofajug/PibjhT4/fagiperowife.pdfIn PDF document text
    • https://cdn.sqhk.co/vinusubat/hirz9ig/download_game_throne_rush_mod_apk.pdfIn PDF document text
    • https://site-1177944.mozfiles.com/files/1177944/drivetime_payments_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/iaPUgic/ballet_barre_workout_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/UiMGij6/skype_vs_hangouts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/kHagfjj/kukebowivelukogis.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/agjfijf/lavunusejo.pdfIn PDF document text
    • https://site-1174819.mozfiles.com/files/1174819/capstar_flea_treatment_tablets.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/rhihjV3/wijomigomirufajuru.pdfIn PDF document text
    • https://site-1168383.mozfiles.com/files/1168383/b__a__pass_2_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/hch55ih/best_tiktok_filter_for_blue_eyes.pdfIn PDF document text
    • https://site-1175261.mozfiles.com/files/1175261/why_adopt_a_healthy_lifestyle.pdfIn PDF document text
    • https://site-1227117.mozfiles.com/files/1227117/fuzoronorodaxiroki.pdfIn PDF document text
    • https://site-1178425.mozfiles.com/files/1178425/dezepuranorikanipofiximef.pdfIn PDF document text
    • https://site-1199825.mozfiles.com/files/1199825/lobster_trap_art_islamorada_florida.pdfIn PDF document text
    • https://site-1166673.mozfiles.com/files/1166673/disposable_face_masks_near_me_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 5304 bytes
SHA-256: b7483ac69e225168c7e9bd9d0b895f756f3c70285ce3bbb68ffb8ad1220606ca
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 3120 bytes
SHA-256: 2d1c02d7faeb7dad5af5d103f135926a0d4fd4e69f3a7da8959d46cf8e88466d
font_02_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 9980 bytes
SHA-256: aad45dc5c4dd475db87ea6038e72d9250a105b6fd9fbd9d9d104bda9f34f740e

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