Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8e5851dc330e91…

MALICIOUS

PDF

63.6 KB Created: 2020-12-04 02:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 24b10e03428ab10e7e1c39f3b5ed272b SHA-1: b9b0d04efe49953201c2c40fc72e78f5c0098a08 SHA-256: ed8e5851dc330e912021f7b5ceaa9adf822ff8d2ced7b134476864121994537c
156 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 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=parts+of+similar+triangles+worksheet+7-5 PDF link annotation
    • https://gajitiromivalot.weebly.com/uploads/1/3/4/4/134475956/0b0d8f94d.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/4700369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc85de25068e.pdfIn PDF document text
    • https://kigixefowu.weebly.com/uploads/1/3/4/4/134496532/3cce40ed7ce9.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/acd00c2e-b3c6-4e3a-b368-1befe5101067/in_noncyclic_photophosphorylation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac58b9e-0af1-40be-a4e0-f6b0b6a452ee/puggle_puppies_for_sale_in_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6568913a-2775-459b-b1ce-da6bde74ba1c/52674257697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db3aeab-fd17-4b00-8bd9-6de0cc0d0985/73919550638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c9dabc-b6bd-4a74-a3d7-9f4100a150d4/29201981118.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/topic_avoidance_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425b2338-c9e6-4ee7-b56e-166914e55d4e/balox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70645f93-5175-4ed6-8f66-8c878b5e54f3/xosapalelap.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/minnesota_driving_manual_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1e60e6-d183-459c-80cb-6f7ae805c8e1/sistemas_dispersos_suspensiones.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_off0000bb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB59 5572 bytes
SHA-256: a2c1462bb7a63319d1b7144cf98126732aa98a4b1197f30cb59c8fc6eaed5e92
font_01_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 10336 bytes
SHA-256: 6242484d95574b69dfce280ee1555a2ff2375d5296cfff6a2fb508d3fd3c390f

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