Malicious PDF — malware analysis report

Static analysis result for SHA-256 485d7781cda2d4c7…

MALICIOUS

PDF

73.8 KB Created: 2020-12-21 01:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d860e7c7a2011e390b20ca28b6e9a236 SHA-1: 4911ae4a4781755be85a85611b820e675e399e32 SHA-256: 485d7781cda2d4c72c814f441c22a51fa43955248c4e6f53823c3aa3c32cb25c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO manipulation attack.

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://trafffi.ru/123?utm_term=what+is+adjacent+angle+in+parallelogram PDF link annotation
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/8848376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5fafa8efb46b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f9ce67b9096d.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/f6d08e.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/f1bded0026282.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/nifudigutedej_lezuzakuripazo_vaxaporaxajuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e911298e-d847-4680-ad3d-2f9ddb78c710/flight_rising_breeding_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b095f8-b0f6-4ff0-8728-96415d782ac1/elmo_had_four_ducks_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf56ec50-42c1-467b-9c08-b910eb024523/sejabaripujumez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df34822f-1c04-402a-9434-8ae319ec644a/the_chemistry_of_life_worksheet_answers_chapter_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6122e5-ab8d-4aaf-9e9b-bccae5003aa4/fivutivaxifo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 5576 bytes
SHA-256: 59ae284d85a5d1eaa8892c54205088cf0aba34f04c423a7248e5ad1776618693
font_01_sfnt_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 11344 bytes
SHA-256: 2ce0725a26a830477e5e9147a0111ea6b5c4cfd4e69f74bae90480ef78485bc8
font_02_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16484 bytes
SHA-256: 010dd46b14f1ae8c1a16f937522f6b6edd63da2a997b389a98e714e1231c8fef

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