Malicious PDF — malware analysis report

Static analysis result for SHA-256 e518870b0f64bd92…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 11:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8548b8434888f945f50841b15e6f54c5 SHA-1: bfe66cd2a48825e7dd969eacd234e4c90171cbe6 SHA-256: e518870b0f64bd92952c9a157f5d64328c1ac390af42fab9648a48075013450c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed to link to external resources, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=csulb+summer+2020+refund
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fa73f38cf4f7.pdf
    • https://wigemixez.weebly.com/uploads/1/3/4/2/134265991/c34c1a2c6d6ab8.pdf
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fa5534b2221a.pdf
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/25b636d4.pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/belodutur_gexobofilapuza_fidipatokuno_lexofomodoguka.pdf
    • https://cdn-cms.f-static.net/uploads/4451208/normal_5fa1eb90bd169.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f9770adeaa9c.pdf
    • https://cdn-cms.f-static.net/uploads/4470408/normal_5fa9fd66eff03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9af142ff-6cf2-44e0-a0e1-9bcf9d557a8a/ww2_zombies_groesten_haus.pdf
    • https://uploads.strikinglycdn.com/files/1c21253a-6068-4994-b598-12c7efa3acfe/widekavexab.pdf
    • https://uploads.strikinglycdn.com/files/5d522ca9-7de8-4ad2-b366-249d2ca61670/waserop.pdf
    • https://uploads.strikinglycdn.com/files/9fd3679c-552f-4965-a2de-7180ab6918e6/kovezamewimovibixikemu.pdf
    • https://uploads.strikinglycdn.com/files/29a8e8c1-8e10-40fb-8890-1df0745a1677/46221107818.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_off0000cc75.bin
aab4da9ceaaedc0f916833510895b20cf43217ca9dc2c1f93c85008d9548e14e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 5164 bytes
font_01_sfnt_off0000ddec.bin
02a584d86b75c2b5d23ecac563f5b1f279703c0544af4e082fc35a2497c7a11f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10432 bytes