Malicious PDF — malware analysis report

Static analysis result for SHA-256 c031f6de0386c024…

MALICIOUS

PDF

74.5 KB Created: 2020-12-07 18:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 90ff3366158e8e37de631932b6652042 SHA-1: 2dc36520641bf9be97cdcdc1e3efb9a05ed476ae SHA-256: c031f6de0386c024a75028194393d5a19a222b42cf485bd669ac4a553294e2ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/strik?utm_term=urusei+yatsura+2+beautiful+dreamer+plot PDF link annotation
    • https://xexofomes.weebly.com/uploads/1/3/4/4/134489610/bajejovorufolijar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f873ff87b773.pdfIn PDF document text
    • https://mudekireziwafa.weebly.com/uploads/1/3/4/7/134730614/4051303.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/biratamisovogi.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/2343508.pdfIn PDF document text
    • https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/jegipozor-dapen-talelaf.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/f47d9d1c-e914-4022-b032-31ae971a39c5/poulan_pro_riding_lawn_mower_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/61210070426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d84e4b-8625-4537-a4e7-d38d16e8de22/3254517583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cae14d-773a-4fae-b74a-f7dbc684024a/wiwojiwotimudixobe.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/fcpa_resource_guide_2015.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 5552 bytes
SHA-256: 8dd80271994fbaa9797e31d4bf8fafc2fb88cebe2a25638420f61a52be24a930
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 11216 bytes
SHA-256: d3b4e9719b38c3c4c8cf82cbd05d3779e4a33d2be4fdc3d8d23f1e4c7795de4d

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