Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f61bbc487df958…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 20:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ae6c0542d6514a930f3cd9bf6a4d3fd5 SHA-1: 52c87120c01ab51f089b9a990a0652fcb2dd09f6 SHA-256: 54f61bbc487df9588e89a82fbf5fe5ed51134bf0049d9f9bafe29cc03c0b9f07
206 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 0.9997

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://xajibur.ru/123?utm_term=yard+machine+22+ton+log+splitter+parts PDF link annotation
    • https://cdn.sqhk.co/tebefaravuz/ihtjhge/54232109715.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/5964519.pdfIn PDF document text
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/1134261.pdfIn PDF document text
    • http://gejepixaso.iblogger.org/77758741485.pdfIn PDF document text
    • https://dukazegisow.weebly.com/uploads/1/3/0/7/130740117/kelilavuru_punexuwofan.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/3423429.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/4837908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_601983be3d407.pdfIn PDF document text
    • http://xotekalulomeb.iblogger.org/58373695906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5fdf1897eaf39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_5fdc258b11780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxudapese.epizy.com/45039419045.pdfIn PDF document text
    • http://zonizuziguzapi.rf.gd/69251510372.pdfIn PDF document text
    • http://kagabefusexem.epizy.com/16282490392.pdfIn PDF document text
    • http://tifureboriva.epizy.com/49078916948.pdfIn PDF document text
    • http://botalibinizor.rf.gd/chorale_from_jupiter_piano_sheet_music.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 5580 bytes
SHA-256: b44d7c3e05d775776bb083ddea62427b0c218ce897fe612bbb7295d938b0ee63
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 11348 bytes
SHA-256: d118db71fa4d3801d324b7d95080e6ff98207c871fcb7598b7163f564e6b49dd

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