Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc16791840c0f660…

MALICIOUS

PDF

64.8 KB Created: 2020-12-16 19:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a7c627bee5c78c759134304462344468 SHA-1: e7db5b968dd1a765a6b9aff3f5041f759db6f75d SHA-256: fc16791840c0f66019b252c7fd664d71a3daeaca72a7a751761dfc99e67a5940
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF documents. One of the primary URLs, 'https://trafficel.ru/123?utm_term=2+to+the+5th+power+equals', is directly embedded and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious content.

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://trafficel.ru/123?utm_term=2+to+the+5th+power+equals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5fb2b59eb4c43.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/buwupi.pdfIn PDF document text
    • https://puramekekekiz.weebly.com/uploads/1/3/4/6/134648744/naviso.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/368e3a6c199222b.pdfIn PDF document text
    • https://tafajasezo.weebly.com/uploads/1/3/4/3/134312542/a6d18c4ff4ba55c.pdfIn PDF document text
    • https://judirarizase.weebly.com/uploads/1/3/4/6/134645007/60c46862c24dc4.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/pirosisob/68997628175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5ab16d-a58c-464b-8d2d-010b9394c991/onn_wireless_mouse_wont_connect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f88da4-5829-457b-ab07-b01599ff034e/21642501226.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/pitamuliwisebidup.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/22943522785.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/agency_fb_normal_font_free.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_off0000bdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC4 5284 bytes
SHA-256: bdec617e6fe2c1baf2301c90e773af22a97897eb168c7f170848b07e18e03f0f
font_01_sfnt_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 11920 bytes
SHA-256: 32906dcf6253b812e32390c834b4816b40f88061621f6d5005c1458fd5219391

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