Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c18ab40363dbd78…

MALICIOUS

PDF

72.0 KB Created: 2020-11-18 08:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b7824f9f3917fa6ee2e46de193077560 SHA-1: 5a146f74181c6addc2e3c59faa9414a9df7df234 SHA-256: 0c18ab40363dbd78277538c9aed4ff1793baaef58dc9c87a5beaef6359f49628
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for downloading an 'apk' file. The document also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to distribute or redirect to various content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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/123?utm_term=sims+freeplay+hack+mod+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_5fafa0bd6550a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f8f494b839fb.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/tozonojujonosejuxow.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/65bd0bc759.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://s3.amazonaws.com/jezekemunidup/sodetepid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7c7598-e68e-4179-be8a-67770f467894/sam_broadcaster_4.22_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f3417f-dcf9-4d03-87fb-2815a34e5cde/sapigotufuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b1030a-7670-47e7-8abd-87ba6d2c9e3b/the_isle_of_the_lost_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/ravixuxubonugaxoropomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8b9452-954b-4566-b793-4418cbe1f82e/zitubirijigonurefusejo.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/vuvexovosawemijen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec59fdd-1f80-4fac-8e08-25d20489f1fd/imei_tracker_apk_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/messianismo_e_milenarismo_no_brasil.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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 5464 bytes
SHA-256: 498dbeea7b0b5de93bcc450d1f8bef10e37eb0768aa91c339a47baff8bc86dca
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10640 bytes
SHA-256: b91b9e932bc19f9cd7e3d5ad55af1c84f6c7493f4ef1c7eb9dcdcb915c581af0
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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