Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9198721a590091…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 15:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce86eab2e50d21ed95efad5e82c5c0d2 SHA-1: 515b25f7cf1ee2bcc40119f39292eedacba71956 SHA-256: ab9198721a590091a6f26f04cfe747ccc662b7e1dacdffd75031698c1d5f0f4c
166 Risk Score

Malware Insights

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

The PDF contains multiple high-severity heuristics indicating suspicious links and a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/123?utm_term=afsar+bitiya+serial+video
    • https://cdn.sqhk.co/sovanoniwuva/h44jjhj/craftsman_tool_set_450.pdf
    • http://lnstagramverifiedbadgeservice.com/8267686267164xdc.pdf
    • http://zootime.store/manual_instrucciones_impresora_hp_deskjet_25441vuva.pdf
    • http://sexesex.site/shades_of_blue_episode_guide_season_23yhkm.pdf
    • http://cmb-societe.com/rogoxavogebobovuwasupanoa447y.pdf
    • http://com-login8.xyz/w3schools_bootstrap_tutorial_freerhf9a.pdf
    • http://save50.pro/tiki_taka_soccer_apkpurekalye.pdf
    • http://the-job.ru/mobogenie_app_marketmolbz.pdf
    • http://autobuff.xyz/131736905307z52j.pdf
    • https://cdn.sqhk.co/wemitupu/bkifruc/3038148891.pdf
    • https://cdn.sqhk.co/jevamivuvugi/jh2qUuc/musica_para_bailar_ballet_movidas_lista.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_ffb774e8c606499190ffbf93ec9d2b9e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4eba2adb-d685-4785-9f5d-be4e65167ba3/how_to_get_royal_flush_in_zynga_poker.pdf
    • https://s3.amazonaws.com/punagilelabon/politique_linguistique_dfinition.pdf
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_46934776a09c424abcfc2b976f9f7ca5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d807cba-6800-468e-8608-125f3d20fffb/45960831163.pdf
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_bf691e10be714f829ad46fc2a972cfbd.pdf?index=true
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_4c2a231030fd4e5dbaafa2389fe7fb35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6473175-88d7-4304-b371-78d3cd638b6c/13545889370.pdf
    • https://uploads.strikinglycdn.com/files/98e37920-1038-4875-a318-2739e346e2e3/95430019042.pdf
    • https://s3.amazonaws.com/rurosaveruk/arena_of_valor_philippines_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/cb9f679f-6ffb-4efc-8e8e-0c12993fcd3a/4451539820.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_off0000e25a.bin
0aef30a5d4351eb2ad53be9565fe4c0c1d19437c2816328b416b96f5f518b33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5192 bytes
font_01_sfnt_off0000f423.bin
0a273f4ce5b82806f3d06c30cbeed3459947fbaca0bc9feaa226e810927d3fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10568 bytes

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