Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffc2a6295017cb5…

MALICIOUS

PDF

64.5 KB Created: 2020-12-03 11:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73a3141ffaa53f16d6234fa610be122 SHA-1: 1bff47c1bfec21943c9911ce33526e5f55ca3568 SHA-256: 7ffc2a6295017cb5353eabb5c73eac713c192bf41b1dff27441ea4449c75a5d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external links, suggesting it functions as a link farm or phishing lure. The embedded URLs point to potentially malicious content, and the overall structure indicates an attempt to direct users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://traffine.ru/strik?utm_term=nsf+reu+supplement+2020
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/kuvikojugiz.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fa3981a22c3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60d8ebfb-3e97-427f-9ed4-955c39980d82/53210505345.pdf
    • https://uploads.strikinglycdn.com/files/46e61a91-dc9b-40b8-88f7-2d26f210d144/79451328993.pdf
    • https://static1.squarespace.com/static/5fc1a921df132613bbc31d79/t/5fc88fde13f8d93bf2084ff7/1606979551479/victory_day_russia_parade.pdf
    • https://uploads.strikinglycdn.com/files/9a0a045a-baf1-457e-9717-2ea92c23b517/1628503210.pdf
    • https://uploads.strikinglycdn.com/files/3b498654-f54c-4a03-ae93-f7467ff7498d/nucleacion_y_crecimiento_de_cristale.pdf
    • https://s3.amazonaws.com/vinejivunitego/11034604254.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_off0000c06c.bin
16e303a2a1beb2dcea2100d2993b9b9956381e5bcd1ea4dca121f07d7eeaf89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC06C 5080 bytes
font_01_sfnt_off0000d1a9.bin
d39c433f6328a20590a072e864e06ab94fcd47e56cbe5cbcdde3a1aec20e3c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10672 bytes

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