Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dae8f01500db097…

MALICIOUS

PDF

67.1 KB Created: 2020-11-12 19:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 77df98f3bf04e8aef35011a7827231e1 SHA-1: 242c2bc74e0f7888439450479522999754ef39d1 SHA-256: 0dae8f01500db097054f7f9515eb85de9e0a3e2e9c0835573ad611692a4bf86b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=lesson+8.3+practice+a+geometry+answers+pages+473-479 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_5fa7291738638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5fa1de5168303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f874064ed75d.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/af6b87f725dd.pdfIn PDF document text
    • https://wemugevesusufe.weebly.com/uploads/1/3/4/4/134467109/gegivutef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8df1b9d9242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5f91eceda2e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5f98fd9da6f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5fa81cd2a705c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5fa065643f53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5f8e431c0be76.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/4b4a67db-161c-4370-81b5-a4a3019ab2b5/50019242810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0262fbe-dfe9-49b2-b954-3a5b6b27d4da/mediamonkey_gold_lifetime_torrent.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_off0000b9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D9 5892 bytes
SHA-256: fecc6bf69362cae95e58db3f688fd0a83216cecb832c418dfa9bc48a40c59216
font_01_sfnt_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 10592 bytes
SHA-256: 385a2604ee99ffd251ceb5b8140fd5c145ab57969d5e2dc3aab5c12ffebf08f1
font_02_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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