Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15b47c63a74bd67…

MALICIOUS

PDF

78.2 KB Created: 2021-03-23 15:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76c9d6129ff4cd1c96b943afed223267 SHA-1: 9c1b0f84b77344361c4f9a410af60d3119ccd879 SHA-256: f15b47c63a74bd67c8bf15f9abf7777ee6eec37dd7a9d7c303f0f519499de05d
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 0.9998

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://zajinet.ru/wix?keyword=wa50m7450aw%252Fa4+service+manual PDF link annotation
    • http://foselosen.sportsontheweb.net/arabic_baby_names.pdfIn PDF document text
    • http://fisitupogavi.mypressonline.com/11256113223.pdfIn PDF document text
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/4954700.pdfIn PDF document text
    • https://joginogi.weebly.com/uploads/1/3/1/1/131163620/jezebutodukogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gateme/81127499391.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/how_to_lose_weight_in_15_days_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/telof.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_53e3b2fee25c4b028d4d3b8c6045dbe3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/15891902051.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/antithrombin_deficiency_guidelines.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_aa70fa96657a46ec95fb70bc9bc26a46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxulija/xemiwexusisizokopejami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec86fc1f-c4fc-4393-a28e-3454f50ab588/the_seven_spiritual_laws_of_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/what_is_dominos_crust_made_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69faf319-f3c6-4632-88b9-560ca8685993/where_is_the_wps_button_on_my_fios_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa27836-a1b8-42c4-9015-bbd83996275a/58507405420.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/rscit_answer_key_30_september_2018.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_f29acc64a4094f6b8335546adc166f19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/71469993356.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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5580 bytes
SHA-256: 2172ece470bf6d46f0eca480e18132bb48c73135905499c823b47e33df075c89
font_01_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 10848 bytes
SHA-256: bcf4f4d8dec02ea848b7601d764a295b1b2aa1dde952142036a0f099c3b09841

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