Malicious PDF — malware analysis report

Static analysis result for SHA-256 6683f8c60590c5c5…

MALICIOUS

PDF

119.5 KB Created: 2021-01-05 18:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1139fe1255a30634e6e9edc9f14a2ace SHA-1: 7d6d96542f2c68a2c30aa0bf2c88bbd44726e38a SHA-256: 6683f8c60590c5c5e1b7123e3d358c80fbf259aac7c4e5e3c52a6052c8e2c163
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=arduino+touch+screen+projects PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480755/normal_5fd8b119cc4ac.pdfIn PDF document text
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/gegututamev-disibano-penikugitopug-wavosibuwozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f925f557e659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f90807c1be23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8712c284ea5.pdfIn PDF document text
    • https://cdn.sqhk.co/sirezozere/jc0Hig3/21341344491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5fa34675ee06f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa184295-6d8e-40d3-bc3d-fc33f58d022c/24421665343.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/69649468325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484833d1-a948-49d1-8b9e-c38a3b8cc634/zara_tasveer_se_tu_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21730f39-26dd-4e57-b1ea-1fa7e8658bc8/93628679037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bbdf5f-6c26-4221-b930-002ea6daabdd/37568191552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c82cd86-53f9-47b7-a8f7-c4d27c67f77d/bee_craft_activities_for_toddlers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000199e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x199E2 30332 bytes
SHA-256: 2bb662825c1fbd793f2342119ee127415951fd4ecc8a52c620e4003b1491f0db
font_00_sfnt_off00016138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16138 4984 bytes
SHA-256: da8885536661f3cde482e71a3159e1424d900f9cc062a1ca368b9a991f5cc4af
font_01_sfnt_off0001722d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722D 11616 bytes
SHA-256: c068767f397345d91e7844063aa2d337703e2430eed17920be7dc4b79938c9a0

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