Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f51a3f4d3b86757…

MALICIOUS

PDF

68.3 KB Created: 2020-11-23 01:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9449d1e526aa8d3f0e244f6c8fbba4c2 SHA-1: eb034213fd5665a8025cf636691fa525eb8aad2a SHA-256: 4f51a3f4d3b86757c27e756e139487d935fa55e035bcf67c0231be70c66f3014
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector domains, including 'traffking.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to medical classification, likely serving as a lure. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffking.ru/aws?utm_term=classification+of+anorectal+malformation In PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/vojibiwemaza.pdfIn PDF document text
    • https://gabodudir.weebly.com/uploads/1/3/4/7/134717456/1092220.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/zawigitisomoxelefi.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/2f0453c6-47e2-4126-9cfb-c8aad9290e25/mubafete.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/genebadopisuxorobex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa37469d-f53c-4732-a581-af787a15157e/zitisugalokawalevodigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f95852-6ed0-4a8e-8f3e-f5993d51de14/getomotuvifojimefobodez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1df361-90b4-4013-9c4c-280d0f48d424/iced_tea_maker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3257a68-0a2e-4863-a62a-81357ebf5709/pabejoxegepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9614fc-495e-48c5-b9fd-a3f6628fedd4/windows_8_activation_command.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227a75e3-c750-4450-8d8c-c5795214bc9a/45203889943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f44aa4-781c-4767-8de9-ac356111c5f2/i_have_a_dream_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d826985-748f-4849-b58f-5b0aacac1036/mordheim_collection.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 4932 bytes
SHA-256: ea4076a2668da6a4a0c7d26dbbf8633e1f03c866d2324273b23070eb3605071c
font_01_sfnt_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 11036 bytes
SHA-256: 4ec364986cf65219d7acb10ec24d060039bc541cf79bc031ee027138d3dce6ae

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