Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8cfb17e1a24582…

MALICIOUS

PDF

77.0 KB Created: 2020-12-28 13:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c7a6b8098bcfbf140e6922339d7d556 SHA-1: e1e36e50a5a1e0addf02cf095e2e9b6af2db4621 SHA-256: 3c8cfb17e1a2458211c38a9fe5488ce3cc1e66bbdead2452a6e726136d4ae311
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. The presence of a malicious redirector link and ClamAV detection strongly suggests malicious intent, possibly for SEO manipulation or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=design+lab+ucsd In PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/silode.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5fe0ba11b14be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488592/normal_5fcd7726f1205.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/d90d681938a4f2.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/6367849.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/turivixisilotolala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcf98668b0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fd66f63e712e.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/e056bfb8-8443-4ec6-8f01-daa7adef5abb/sepia_in_photoshop_cs5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddda56cd-c490-4fbc-bac3-2f2762471379/dikufetonejutuzajowawak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f577d2-e452-446e-9949-ccc8ee3f18b4/17045520968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf8d5c8-8635-4520-8a3c-793ee7d3f809/2944241929.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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5148 bytes
SHA-256: 116aa928c95597574424d5fe21a3c49b766e7918ed5eb820cd879fa16b0b9cd9
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 11200 bytes
SHA-256: fda7d20674c8cf2258bd1aee36edc18fdda89fba8bf78a88f2fae8c7e2e60c9c

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