Malicious PDF — malware analysis report

Static analysis result for SHA-256 46828329d85a8dbc…

MALICIOUS

PDF

85.9 KB Created: 2021-01-03 11:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b2a3a157d13bf00de33cd46a38efd493 SHA-1: 158da1d8022b27c51967d703c5a839592e72b7f2 SHA-256: 46828329d85a8dbc1979abccfd015b73f9aa42e8ce27582a6f83a6d4d347c3ca
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'trafftec.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', combined with a 'download button' heuristic, points towards a social engineering tactic to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=transcription+and+translation+answer+key PDF link annotation
    • https://vasedowazapen.weebly.com/uploads/1/3/4/3/134320052/ninotalasorovo.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/ggeWGTW/gambero_rosso_ricette_jamie_in_30_minuti.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/2e4f8654-3c77-47e3-b077-31819291a904/49104101060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1140b625-b6ed-4972-bc72-7b1ee9876de3/60563780146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6ad371-f130-4a48-87aa-25ba7fa9119e/ligejuvitupefifesime.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/66934997787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531910db-b2ac-44bd-8807-5586e89623da/romeo_and_juliet_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/scooter_blenny_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/wonexoposagiragapadoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e0f849-d937-4d3d-889d-31b2756bb6e6/sewuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a8e150-c65b-49fb-86f4-319daf088797/harpercollinschildrens.com_pete_the_cat_saves_christmas_song.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/accounting_principles_11th_edition_solution_manual.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_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 5276 bytes
SHA-256: f0717464594efbcaa8b45848c8076b550199e4fafda518a43ea904710b0db3f0
font_01_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 10216 bytes
SHA-256: 1970f9ac34bc31ff3d577ea42a6feb90bfe5b72051dc82c9bbb576fe74d5773f

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