Malicious PDF — malware analysis report

Static analysis result for SHA-256 28277af4bf245c60…

MALICIOUS

PDF

67.6 KB Created: 2020-11-21 23:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64d0fd33e40a519a200a58975c1cfe0 SHA-1: 76a19ca37ff13f4a50c97d2a07fb73b4b3bc8a54 SHA-256: 28277af4bf245c605354544c1e0213f2b23c6cb2cf9050ac61322fa0ec1eb7e2
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 phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this file as malicious. The embedded URLs likely lead to malicious content or further phishing pages.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=ppl+flight+test+study+guide
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5fae1ceb2602e.pdf
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5fad76f48536b.pdf
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/dezugexonopex.pdf
    • https://cdn-cms.f-static.net/uploads/4445888/normal_5fa83c128c052.pdf
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f8fe67d72ca2.pdf
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/mifomekoriz.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8ed120494ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wofaxil/65829634486.pdf
    • https://uploads.strikinglycdn.com/files/fe9547d0-2869-4c86-ac2b-fba288f9c731/rarego.pdf
    • https://uploads.strikinglycdn.com/files/c8a94a1a-555b-407e-aa45-f217f33d1a4b/50102935751.pdf
    • https://uploads.strikinglycdn.com/files/e934460f-aedd-4437-8fa0-9b7af1b669d5/442198689.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_off0000cbc3.bin
a63a340b210f0b2738baeb8ca4075a320b3f6dc11a0f941ff0e39edccddd04b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 5100 bytes
font_01_sfnt_off0000dd2f.bin
b4a15b4e7a3283cafab01e1e1d5bbb035e592d58e4dae0895d1cf5b1cc2a0e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 10836 bytes

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