Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a51fadbdfc481c0…

MALICIOUS

PDF

73.7 KB Created: 2021-02-17 21:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: facc852bc774a8df343325dd1d787bd8 SHA-1: d009912b2ebb0ef5ace87c0327d41cab1573757b SHA-256: 7a51fadbdfc481c064db60a377dda5bcfa2447690fb475f97407ab3a7056d86e
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains a product name and application metadata, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/strik?utm_term=vintage+polaroid+sun+600+lms+instant+camera PDF link annotation
    • http://steblin.pro/arjun_reddy_movie_kiss_scenesvthi0.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/jgetZ2g/zenonia_5_apk_unlimited_zen.pdfIn PDF document text
    • http://igcopyrightclient.com/roneduttdd6a.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/jahejjc/best_music_player_no_ads.pdfIn PDF document text
    • http://penaxuwilamufo.iblogger.org/kitiw.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/abybESz/lavutavusadenibudimupib.pdfIn PDF document text
    • http://fragcups.com/catia_v5-_6r2015_crackjtyjs.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/MwI0hcd/academy_awards_2021_cancelled.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/bGd3Ob9/xulunok.pdfIn PDF document text
    • http://nubolutlion.xyz/who_dies_in_avengers_endgame_comicpo8t8.pdfIn PDF document text
    • http://lestyprin.online/16308401406kvapi.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/oijXr1q/63681670966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/70446828424.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/bejeweled_classic_apk_full.pdfIn PDF document text
    • http://loxototo.epizy.com/datasheet_view_access_definition.pdfIn PDF document text
    • http://gesosogo.rf.gd/my_bp_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/suranevovijodinamebumi.pdfIn PDF document text
    • http://baxajuzurajuj.rf.gd/air_crash_investigation_special_report_season_1.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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 5652 bytes
SHA-256: 8133f64771cbe93f8d63dca79ba1116b735fa8e8f3622603e431b20f35af6287
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10956 bytes
SHA-256: 9a39e51e40d16f77a69a5e9349521053f9730f352aa685e1b323d068892200bd

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