Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fa88c881882573…

MALICIOUS

PDF

75.2 KB Created: 2021-02-21 23:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8a6420d745b07f5eeb1bc568a68a6557 SHA-1: d1698510a68960246ee8aa45452d875fd4205bc4 SHA-256: 35fa88c881882573db4e32cfc0b87256a57ba08dac1be538da7289c75a52d8fc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to popular media, likely to entice clicks. The presence of numerous links on disposable hosting further supports a malicious intent, possibly for phishing or distributing further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wix?keyword=watch+the+amazing+spider+man+2012+online+free+dailymotion In PDF document text
    • https://dozajumeguru.weebly.com/uploads/1/3/1/3/131379069/vafuminosi-rezepir.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/bgdpi5O/nagixixafoku.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/iia0Fjd/real_bike_racing_game_download_for_pc_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/4yeshic/malop.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/ZjfzsFd/53931802462.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/BijbDbn/jumalebipasonubikeluniza.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/hgjjpHh/luxofumefaxegefuxoku.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/6233052.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/2892153.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/gh5hgly/wovesebugite.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/sefiwegegagu/rinuwogajalalifikepavapaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/dadolofazawevudazevuruxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/5148550425.pdfIn PDF document text
    • http://gigidokolud.rf.gd/jisuriwoxogonuza.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/12305415424.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/wamotipejobikidexegaju.pdfIn PDF document text
    • http://rabibunipidozok.epizy.com/apush_chapter_10_guided_reading_answers.pdfIn PDF document text
    • http://wolaniloko.epizy.com/laputa_piano_sheet_music.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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 6060 bytes
SHA-256: f0ac4129b876946810fcd5afd8135cf7d5dfb86f1b332e3a61b9f1fff2fb3471
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10756 bytes
SHA-256: 45535d361088a46dcc485ed8057cdf22ce983752f87fbc52c7d7f8bdeff24a18

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