Malicious PDF — malware analysis report

Static analysis result for SHA-256 952d20b5ac9a846d…

MALICIOUS

PDF

68.5 KB Created: 2020-11-25 04:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7dbc490e76e5784637a81674f2a9ea4 SHA-1: 1560ea7cede53eeb7ac2e9a05734d64312aa8687 SHA-256: 952d20b5ac9a846d16c8058dfe40091532dd5d6e65421c895b9bb33382087075
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=special+senses+lab+activity+answers
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f959760e46db.pdf
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fa340814ea0c.pdf
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/4349847.pdf
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f9bd78383a36.pdf
    • https://cdn-cms.f-static.net/uploads/4486061/normal_5faa52f607c17.pdf
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f9e17e479bde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d75aab82-3fdf-4ce6-9b1b-f6e8986860d3/cadena_de_suministros_de_bimbo.pdf
    • https://s3.amazonaws.com/muxegeza/xanotunevot.pdf
    • https://s3.amazonaws.com/soxukowotomaj/37242938497.pdf
    • https://uploads.strikinglycdn.com/files/f325252f-f399-4288-a3fc-17b2fc7023a5/jekovodekijatejusokalir.pdf
    • https://uploads.strikinglycdn.com/files/2028ab70-9cd2-4d09-b165-b266ffc23b43/daytona_bike_week_photos_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd9.bin
b70c2aeecc2835e86c7ff01242a9dc42fe00b66dbe98281498f804955ab06f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5424 bytes
font_01_sfnt_off0000e26b.bin
c6bbc879ec8a1c879fcdf6f33476a8875e475aaef8e342222014979f7f24dc23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10280 bytes