Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddcafe6eef3515a…

MALICIOUS

PDF

72.9 KB Created: 2020-12-20 06:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 50c0721645b7806587092d01445a3a28 SHA-1: f565f9d4845198fb3ce9a1f3b489084ce4ee35d7 SHA-256: bddcafe6eef3515a0d128597ee43f2825cb8e6c2cc858eff70a879356ab033a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are to benign-looking PDFs, but one suspicious URL (trafftec.ru) is present. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to manipulate search engine results by linking to numerous external resources, potentially as a distraction or to host malicious content.

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/aws?utm_term=english+worksheets+for+grade+3+comprehension PDF link annotation
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/8454100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58ce9d793648408547d5/1606375631647/51045810738.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/dukimoxotukakiwi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc103f2c6d964583622cf33/t/5fc9c8132f5dbb44b77bef82/1607059477081/archery_shooting_gloves_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca6a1ab-25ac-4fd7-be83-35218e047701/razor_2_seater_dune_buggy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c47fe8-a89a-499a-8385-5c37ea04226d/rate_my_profs.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/lekeletoru.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/bizas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769aff9f-3868-4dc4-bc36-0bf96e828efa/putigizevuwasapevutur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d10546c-db11-4f27-8309-2e869b9bb128/83883025411.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/cbt_worksheets_for_jealousy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab185ae8-90a5-47c6-adf5-087f860a2028/st_lucie_county_florida_divorce_records.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/robotics_in_civil_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b31fb5-517e-4892-af3b-31cf2da0c4e9/99585606046.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/kobulisomi.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_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 5848 bytes
SHA-256: 8116d90098fa1205ec23e65a3bfd038cc6807ecf8fe6823680713ba60605eba1
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 10780 bytes
SHA-256: feedc5914834363fa5a479858862ae327f73ea11b74538cb0326844338f074e2

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