Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1ca5ab0c94137d…

MALICIOUS

PDF

64.9 KB Created: 2020-12-16 21:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9f833209713655a3033a7110f241b39 SHA-1: 91885761a87a0ea3f259c44b3ddb83fcead93d88 SHA-256: ca1ca5ab0c94137dd8876432b74c8556de9ddda92d1c6f7f87c050d9c62dc86c
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 0.9996

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://traffset.ru/123?utm_term=d%2526d+5e+monster+manual+expanded+pdf PDF link annotation
    • https://tagunodakaveb.weebly.com/uploads/1/3/4/8/134865504/sarasixanar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5fa3808459184.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/runagiwoxepu.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/munod-falope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fcd9fd5664ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8f35d93ac97.pdfIn PDF document text
    • https://vobobesi.weebly.com/uploads/1/3/4/7/134702984/2964668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_5fc25a486af31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f8d4ccad3b4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fizufapu/scott_watson_az.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c36ae5c7695ca9b45588/t/5fd052c8cb6bfe602c4d3bfd/1607488201054/castle_fusion_idle_clicker_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/nice_guidelines_diagnosis_hyponatremia.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/anatomy_and_physiology_1_notes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA48 4988 bytes
SHA-256: 34cdb79ca255873ed876bc251d43bedeb0cde3792f741e21023ce4f05a36db8b
font_01_sfnt_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 3484 bytes
SHA-256: b6bc3e761eca8ae26333d0367913862b9788f7109bed8a3dd2635371d897bba1
font_02_sfnt_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 10536 bytes
SHA-256: 05a1e7d8c199d2e5931840a4ae2b86b99747dfbdb8686fe5aa4ed1cc237a4522
font_03_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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