Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b00f9c5464d477d…

MALICIOUS

PDF

75.4 KB Created: 2020-11-19 14:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 341a2e07a265143563373539f1febe08 SHA-1: b86b5b1ec63a3788f706ac8f8a24974a4df706b4 SHA-256: 1b00f9c5464d477d50eda9b0ef232fb8c9625f5b64dd7a58efaa7334e955c8fc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on services like Weebly and F-static, suggesting a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The document body, though heavily obfuscated, contains metadata related to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/aws?utm_term=allshare+pc+software++windows+7 In PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/kunoxuv.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/tamegevikijovigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f8812fe97333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fa091c5ab7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5f95c69b2cf88.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/8870995.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/973a38457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f871212097db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f9daa10329da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/adb6ba1e-1eed-40dd-9779-5ab3e318c081/petty_misdemeanor_mn_background_check.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5192 bytes
SHA-256: e1d8571e3461e999fab008425947abd0e16ff215b599797dd5a27f0ea435d1f8
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10944 bytes
SHA-256: 40ca5a74fa9a19a6073830d42ef2340874e7a8db0b0663f7cc978d63748882cb
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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