Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71a8fcdf1ce1b7c…

MALICIOUS

PDF

59.1 KB Created: 2020-11-25 18:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e05aee0625d467aebdf7718abab8acda SHA-1: 9c6a37b94e06ff8757c01aeb06798083bb26f36e SHA-256: b71a8fcdf1ce1b7c134c37867287ab9e12b0374fa813a40f8f87c3ceca948ac5
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://traffking.ru/strik?utm_term=out+of+many+6th+edition+outlines PDF link annotation
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/revutuwegijimuf_lovisijudafekir.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/tofosuxow.pdfIn PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/4735390.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/texisuzo.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/1402391.pdfIn PDF document text
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/c2fafacd43c4.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/wuwomabe.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/5174d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fb5ea8becc93.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/cfccb3.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/pazezifulura.pdfIn PDF document text
    • https://sokegipamemaxo.weebly.com/uploads/1/3/4/3/134345901/6399629.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/4694e3ab-7e1d-4286-94ec-135d6f3ba360/68210998529.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/pujavegogopesaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/sustentabilidad_del_ambiente_laboral.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_off0000ace1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE1 5332 bytes
SHA-256: feb850e897decd311f5c9e8fef19ae3427dde49bd40c23617d5d08b5d07de0b0
font_01_sfnt_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 9572 bytes
SHA-256: 78db7518f49408aa067a1cc602be338b4f29cb305fc74287fd9b92541898fe22

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