Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a83ccffae92f86d…

MALICIOUS

PDF

75.0 KB Created: 2021-01-25 23:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f9bb1fa27b353dcef6b3e5a05d8db10f SHA-1: 475f4a87a82028f9eb0b344f7e32611ffb5cbd74 SHA-256: 9a83ccffae92f86d00c6e463f60305e6850b7ae6a8e4b32e0b5b911472d8440b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to other PDF documents, suggesting a link farm or a method to distribute further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is part of a campaign to manipulate search engine results or distribute malware via linked PDFs.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=song+for+a+dark+girl+theme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488574/normal_5ff59d0f4b082.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/vovoxotenelozaloxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fd84611582f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5fdf6f012a544.pdfIn PDF document text
    • http://consequences.space/wulukagovugrhuy.pdfIn PDF document text
    • http://esclub.pro/bepavolawupovof6zqou.pdfIn PDF document text
    • http://aduo5.online/lupibetexwya.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/4511664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_60014d0a4960f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fec0c9586d29.pdfIn PDF document text
    • https://puvukiroleta.weebly.com/uploads/1/3/1/4/131455247/wozedoxobavep.pdfIn PDF document text
    • http://wtia.space/seesaw_family_app_qr_code_won_t_scan1472t.pdfIn PDF document text
    • http://setlyb.online/bluedriver_bluetooth_obd2_scan_tooldcvpj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5ff05ca5b7bd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_6005cf47cca04.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/2f2be55fdaf7d8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fcbddc56fdcf.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://tosivasode.epizy.com/blanchard_macroeconomics.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 5096 bytes
SHA-256: 3b4945a15eb3e06d736a18e27468de42e94ebcfd39652254df058bed15bd77a0
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 11132 bytes
SHA-256: 607745ef3d794f606c5092bc25e13958ffb6dd98475f5b7b40d781d71767343b
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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