Malicious PDF — malware analysis report

Static analysis result for SHA-256 4107931f50efbdd1…

MALICIOUS

PDF

84.2 KB Created: 2021-02-26 06:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cfdf4de7998d1f4d1c1b6d34a8b6c1f3 SHA-1: 42f0336f13891f4cd19efe65eb32bfdc8284067c SHA-256: 4107931f50efbdd16a826f189dc28c71a294ae656bb064d1687d37b19a10e5c0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but the primary malicious activity is inferred from the embedded links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

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://druttle.ru/strik?utm_term=what+is+critical+pedagogy PDF link annotation
    • https://cdn.sqhk.co/seworani/4ggc8jg/sixap.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/EAlibhg/servomoteur_dynamixel_xl-_320.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/idt0nif/zomonogizefa.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/teledyne_laars_series_1_pool_heater_manual.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/wawudujej.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/hciagfE/gamedapelase.pdfIn PDF document text
    • http://gallery-shop.site/arudra_tamil_moviehwhk7.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/ghw8QZy/42029885813.pdfIn PDF document text
    • http://train-home.ru/89540689111a6016.pdfIn PDF document text
    • http://alania365.ru/rhetorical_question_grammary5tvf.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/CVhh4ge/vefefo.pdfIn PDF document text
    • http://tryraisins.club/beyonce_jay_z_holy_grail_mp3_downloam7efc.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/GTjbfjj/80086368636.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/aPobVif/xegaxawalivexabemejineji.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/xofomijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/QihKb7J/wet_sounds_sw_808_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://susugafof.epizy.com/calcio_storico_fiorentino_2019_formazioni.pdfIn PDF document text
    • http://bomatep.rf.gd/94469751781.pdfIn PDF document text
    • http://gisobugiwe.rf.gd/friendship_day_greeting_card_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 5132 bytes
SHA-256: a493b917f38fae01ef8cf18817c6c98363dc9b268afb1bec97b1e2039dc9fda2
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 12040 bytes
SHA-256: f2ef0e96d7c78f8c7fc79590bac7718cd44103c1bb5fd24062b9c361473dce83
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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