Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b3bc13a68ddebc…

MALICIOUS

PDF

70.7 KB Created: 2021-06-04 13:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a7cec67c7ba432138df9ef1f6ce8486 SHA-1: 1061e1dc94dc6d5ce37bef80498a60dd20e438e2 SHA-256: b0b3bc13a68ddebc8ddcbc115afa178e5bccc7405ee1ff1edc10e7bd5272f59f
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ketchas.ru/pbw?utm_term=is+cyberpunk+worth+it+on+ps4+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fcecfae9a1d2.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/90457246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_5ffbd16e4e768.pdfIn PDF document text
    • https://puwofevu.weebly.com/uploads/1/3/4/8/134862481/7292876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_606cce6537b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_60134d0f82487.pdfIn PDF document text
    • https://valuzobuxile.weebly.com/uploads/1/3/2/7/132711949/wupimox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144553830/jegijozokubasopikaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dab99d6-6954-4aa0-bd9f-7877b1ab521f/97713200160.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/54145092979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6366bbe2-e694-4f68-a4ac-c054f36495d8/30409850010.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/91587205795.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144425679/firurugejalim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41fdcf3-b161-44bf-8b9c-2f8fc969ff7a/how_to_descale_the_keurig_2.0_with_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a68add6-5851-4367-9092-c3d18ed0204c/icloud_unlock_hack_helper_v3_2_chomikuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bcc689-e4c1-4700-ae09-58cc25239fa9/uncaught_referenceerror_require_is_not_defined_cordova.js.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc5b2c6-f5e1-42e9-acf0-2d1808c8d1e7/kafijetixemavaxiwira.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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 5340 bytes
SHA-256: 90fcf091a31b26caddfe5e6414879791ed2c6bc030241330e6e90ccc4af46ebe
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 11060 bytes
SHA-256: e8a6cf67e30558b3e812ad9b396202b5545ce3c951976dca4614e9150fa060df

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