Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfa9f347448d723…

MALICIOUS

PDF

78.8 KB Created: 2021-02-27 05:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 57e929079b96bf2126ea73dd98e04b26 SHA-1: 60523e32e4e663b5f4186a18ebcb315255f06665 SHA-256: edfa9f347448d723bd68a814191c9e3827a08ea69524a9b2bd8453dd9536cf16
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including critical alerts for malicious redirector links and ClamAV detection. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'malicious redirector' heuristic indicate the PDF's primary function is to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=will+roku+beat+earnings In PDF document text
    • http://wedipum.mygamesonline.org/thinking_fast_and_slow_audiobook.pdfIn PDF document text
    • http://activa-fb.com/17892086026yoyxf.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/vewomo.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/3.5_ranger_prestige_classes.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/platicas_prebautismales_cuauhtemoc_chihuahua.pdfIn PDF document text
    • http://salonly.xyz/drill_down_reports_in_csi506x9.pdfIn PDF document text
    • http://sun-italy.space/used_coleman_hot_tub_partsq8p27.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/vusitepaguge.pdfIn PDF document text
    • https://vunepixas.weebly.com/uploads/1/3/1/4/131483778/nufizibur-xirekupowukow.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/xuxudevezixumud_ruzikisidepu.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/7486215.pdfIn PDF document text
    • http://neyroskakalka.site/airline_manager_tycoon_2018_hack_apkg4nfv.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/gixukizezagabo.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/40114753112.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/jenepomox.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/jagex_sufireneso_zalogor.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/1433455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/tolunuzegej.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/what_are_the_qualities_of_a_bad_husband.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/los_hermanos_karamazov_resumen_breve.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/geluvipujibanogifofakowet.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5068 bytes
SHA-256: a961a75045750aa377690c93ee1093377c5b437adcada22c7b7e66a3ea3ba67a
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 12316 bytes
SHA-256: 5ced8fcfaa6a3d550e5ebf9afba3d05426e646ebe311cce5575ef1c2c7a96218

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