Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b38b03381b2d9…

MALICIOUS

PDF

67.1 KB Created: 2020-12-10 02:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d094689b7415a5e5af3b7ae62e9775c SHA-1: 75410486234eccc2413edbe73d8281179ac09b35 SHA-256: bb6b38b03381b2d9958783115763ef2a233ab461ce9933b3d8f4b2863c547ade
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, https://traffset.ru/123?utm_term=inverse+square+law+for+x-ray+intensity, is suspicious and likely leads to a malicious site. ClamAV and an ML classifier also flagged this PDF as malicious, indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=inverse+square+law+for+x-ray+intensity
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f8d03653dd67.pdf
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5fa4a10cc511e.pdf
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/wilugaw.pdf
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fa40d7a28654.pdf
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/nujazesetebago.pdf
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5fc965e338c7f.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8efe0d1f605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc59a22405d5340f349ab9c/t/5fd16f65b91f50015ee23cdc/1607561061715/65872321462.pdf
    • https://uploads.strikinglycdn.com/files/8308ae81-11e2-447c-9c39-cd9d686acbd1/97842991684.pdf
    • https://uploads.strikinglycdn.com/files/8b263177-0782-4697-8c68-dd89c1318e0e/fufipamojadabifoworevoxul.pdf
    • https://uploads.strikinglycdn.com/files/d0801d43-cbeb-441f-8b79-27213d33ff7f/narepenututilevu.pdf
    • https://uploads.strikinglycdn.com/files/30573092-bd6b-4ef7-bb7f-9e174b9b542f/watesunuwafefe.pdf
    • https://uploads.strikinglycdn.com/files/67b67637-0059-4a71-a648-96e40501ba1d/xosavelodusiv.pdf
    • https://s3.amazonaws.com/mexavofezoxi/bupuluramozemisilowukatus.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_off0000cae4.bin
0d64a689ea65f42b0db86d956fd851e4a485293857fcafe150fbe968cb25dbc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 5176 bytes
font_01_sfnt_off0000dcb8.bin
ab0d1451e011afea4ac7deda37cb1d2b82c22152e6af96454cc3827ce1a2e199
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10252 bytes