Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bf722921b01b43…

MALICIOUS

PDF

71.6 KB Created: 2020-11-16 23:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cecbdf02490d407396d09bdced529fa2 SHA-1: de6efb2171029a2296565a412059ad5c55a5d29f SHA-256: 11bf722921b01b43a0cd3d251ecda493f7f80efec04d02f39cd3beaab9661878
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://trafftec.ru/123?utm_term=how+we+learn+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fb2c07d7a3eb.pdfIn PDF document text
    • https://disamaro.weebly.com/uploads/1/3/4/6/134697064/sugaramar_xukawo_todokapojekod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5f967ee16c40b.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/vinivuxo/behaviourism_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/sfsu_financial_aid_counselor.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/avid_venue_profile_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e986101-c9a8-4b5f-b7ea-9f18f2ecf7b3/rod_machado_private_pilot_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/58803774125.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/simipamab.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/kopedujonosolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868bf4ca-f293-4c34-aee1-9abebd1bdd69/36681125845.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/kindergarten_phonics_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d94169-82d7-463a-81af-f2bc46ea7582/pabemulenuvuwixusisifu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/biosafety_and_bioethics_book.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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 4568 bytes
SHA-256: 33ccbea1c49402c2c0367f4ca6752777fc2b05d229ae249f72eae749ff6b774e
font_01_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 8984 bytes
SHA-256: 2d85bdc31c4758f387c3ab101bda0a8a291ef5c2eb0085ca7341b7217032f493
font_02_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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