Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07ec89589155e86…

MALICIOUS

PDF

80.9 KB Created: 2020-11-10 04:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 804acd3afac45a2c476f9e706e6fa999 SHA-1: 9d9dc67d6cede0ff83b597e3bf8caf26ace1ed9c SHA-256: b07ec89589155e86c94649b40dd6dc13b1bdaa6fb648280ed77faecec5336bb7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or redirection scheme. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier also strongly indicates maliciousness, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to search engine optimization and game-related keywords, aligning with a phishing lure.

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://traffmen.ru/strik?keyword=google+site+games+77 In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/4e0d994f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f98430867230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8c275254ecd.pdfIn PDF document text
    • https://tekuximusiwax.weebly.com/uploads/1/3/4/4/134450812/8ca42f293ef76a0.pdfIn PDF document text
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/2ea9ea6e3.pdfIn PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/rovebigubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f906d8c2797e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5f9b275121d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5fa5f47e031a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozilum/a_jury_of_her_peers_quotes_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/5417862834.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/watch_street_outlaws_online_free_season_15.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/turixobetuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ca0e6f-2df6-4a43-9e33-e0e19a2f6ba9/wokiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/dark_skinned_blood_elves.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 5020 bytes
SHA-256: e782e6419175befcf55399c809e2487734d47557047869545fd6155dd877f3db
font_01_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 10476 bytes
SHA-256: f738f88c49c724e7ebf2cc78c7d303199435abb14b5733b33db89d1e493c27f6

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