Malicious PDF — malware analysis report

Static analysis result for SHA-256 b139c7d749bd69cf…

MALICIOUS

PDF

69.8 KB Created: 2020-12-07 06:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1827dd6e9565c9e126390c7b1c02c59 SHA-1: 26f2463493b3c44cff76b210618191fa6f7eab02 SHA-256: b139c7d749bd69cfb57e2bd07265ee426f5b937d141e865b0d377798af35cfc5
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://traffset.ru/aws?utm_term=worksheet+4+the+composition+of+blood+answer PDF link annotation
    • https://mejotumuv.weebly.com/uploads/1/3/4/6/134636951/besidobuv-pukurubexux.pdfIn PDF document text
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/fosebewilok.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://uploads.strikinglycdn.com/files/b1a5d839-c424-4ab9-a623-1a60cbaee558/download_straight_outta_compton_album_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f6baff-6cb0-4bc3-a5e5-fe0eefe2f4b3/cub_scout_law_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553b3856-52d7-4bed-9c09-ef2db730cc2c/manual_de_licencia_de_conducir_comercial_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28f6fa7-84a0-49a9-97a0-5a82ef36594e/panexarop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7c4a14-1984-413d-9c78-f3075f2c349e/93853876489.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66f6492c50b1a1e9d5f03/t/5fc942026cebf66b99a1e5ea/1607025156956/kesevuzusimugivelanaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fb5432-01ab-42e5-965f-add9b033f61d/favoxubifijawage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ce4be9-d936-4dc6-88a3-af19a0f64c5e/85867436473.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b3b3085bf90c0e02b495/t/5fc68de7173fb5383b889cde/1606847976156/58011907635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea52fa6a-f1e9-4464-b088-ab7492453800/how_to_overcome_delusions_of_grandeur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 5580 bytes
SHA-256: e1f15ebce3ee3e750f6dc745883d3a603e700092d97d820bef963e00b43ea066
font_01_sfnt_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 9852 bytes
SHA-256: 9e15c516c7ca4db925581350486cc22e266de089663c4b57d804f5ddeafcf223
font_02_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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