Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9bfd74624e90da…

MALICIOUS

PDF

76.2 KB Created: 2020-11-10 11:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3425d923c70e59a44602200ba178db2b SHA-1: b4b2fe91d806502d8bcc70e72507a905ab3d634e SHA-256: 5f9bfd74624e90daf7a392c877479f1b17de263473e0e8199663d6aa20f3df6e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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?keyword=death+by+meeting+pdf+summary In PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/lorinukasojur.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/kixiv-kuluju-daxevafela-latilukori.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/gugojipelonesek-zutamimamimone-jivigopol-gatufob.pdfIn PDF document text
    • https://nonudefetug.weebly.com/uploads/1/3/4/3/134314303/72fc3341.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/2164345.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/835524.pdfIn PDF document text
    • https://tewodoxes.weebly.com/uploads/1/3/4/3/134368692/583298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_5fa78dfa46c5c.pdfIn PDF document text
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/bba63a4bb2.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/865ae2de-dd92-4d6a-8005-100cedc5817f/42830835359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5cd4f3b-3778-4e73-8b02-47044d60550b/wukajivubovufogoxize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b324e6-7b59-46b6-a595-64a1ede87ff3/kavabaga.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 6548 bytes
SHA-256: 370b63e99b3bc2c1d8b7a2bfc1693e0257dccade0e64e814f912f9e1c3af29e8
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5664 bytes
SHA-256: 3430647d7f77887fb85081dae5271f23460d24c4dc5561badf77421976c2a245
font_02_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10948 bytes
SHA-256: 4b5e4f8cb1397d47609875a7134248385074d8d30b9475dedcfde0502e23d839

Open this report in the interactive analyzer, or submit your own file for analysis.