Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6a7c0217b9977d…

MALICIOUS

PDF

70.0 KB Created: 2021-01-14 13:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9848785a802be51bdac1c1f355389416 SHA-1: c2f9e34554abac8719e8a98b479afe243411712b SHA-256: 5d6a7c0217b9977d22a620e9f3a7c781b023ae5d47139b48583942375e896a84
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. The heuristic firings indicate this is a malicious redirector and a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=duarte+high+school+bell+schedule In PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/kalinakuba.pdfIn PDF document text
    • https://gudeworidive.weebly.com/uploads/1/3/4/7/134767917/c11589.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/lAaggjc/13727356726.pdfIn PDF document text
    • https://site-1176767.mozfiles.com/files/1176767/hide_and_seek_seeds_for_minecraft_pocket_edition.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/6589686.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/a5889b5f7215105.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/mokogiburizuko.pdfIn PDF document text
    • https://site-1183131.mozfiles.com/files/1183131/asva_the_monkey.pdfIn PDF document text
    • https://site-1171899.mozfiles.com/files/1171899/algebra_2_piecewise_functions_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5f939c9794741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_5fb44ac9b7c50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 5340 bytes
SHA-256: 2808b4db6da53001f96a1912f3a71a9f3c3fa60a230d74760dd281bff3a74184
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 11112 bytes
SHA-256: 2e9b10eeaea11f6de405019c5e6949ed6ae5edcf55dd2e79ad4931b626daef80

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