Malicious PDF — malware analysis report

Static analysis result for SHA-256 8737559cf9025f87…

MALICIOUS

PDF

63.6 KB Created: 2020-11-21 19:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7de7d0e612b9fe8fada6e7f5a0fc9f26 SHA-1: 1308902828e0ba17925dbecc25f06b3d2e773235 SHA-256: 8737559cf9025f870e0bf0df4c9dd10d3a4c6f2088f82527fe0830849361b538
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with the primary URL being 'https://trafffi.ru/123?utm_term=fraction+tiles+virtual+manipulatives'. This behavior is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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=fraction+tiles+virtual+manipulatives PDF link annotation
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/6137385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_5fa3b50016ab0.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/d2f142.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/kawotexulozax/10150843455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4299b4ab-bba6-4cb2-bb96-6172eb6b0e5e/spring_valley_collagen__c_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c6526d-23d1-4325-9d23-79a35178200d/norusatenufuzojetosor.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/348927977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f106dda1-093d-4187-b6bd-53b900abaec9/the_juicing_bible_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/comparing_fractions_on_a_number_line_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/s_letter_love_status_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32e24e9-b769-400b-961b-bd5d84ef057a/70675665924.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/22719440095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff6b02d-52da-4293-93b0-dae9b439a00f/sivodixuwe.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_off0000bc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC42 5096 bytes
SHA-256: 0837f521e4a3b20d02e49a4571b9fc91e9a409a646b58c3a56d8bccb0d10a7d2
font_01_sfnt_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 10696 bytes
SHA-256: 8ca769abbffcd45985ee1b4b971efce4ea8edd1e1564e5b4c85e83011ed6f3d6

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