Malicious PDF — malware analysis report

Static analysis result for SHA-256 b674ea40b528f513…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 00:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54f07185a38f219aa1f5426afc2e8444 SHA-1: 01236b8e9c98e88600fd5e1685708165afa5367d SHA-256: b674ea40b528f51357844e5db127c1ca9215a32be2a102cac4069d17257f83c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_URI heuristic suggest the primary goal is to redirect users to potentially harmful external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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://queure.ru/uplcv?utm_term=marketing+management+and+strategy+doyle+pdf PDF link annotation
    • https://keralatemples.info/ckfinder/userfiles/files/kamalaretoge.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/zerazuti.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/2964563317.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917050223.pdfIn PDF document text
    • http://usagimatur.com/files/others/fafumumija.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/90749578597.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/segivilabomiro.pdfIn PDF document text
    • http://schokobrunnen.com/idata/89573159322.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/20654944729.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/81311140062.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/47123740192.pdfIn PDF document text
    • http://askaudit.ru/price/pedojikugomuvox.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/siwebugimafu.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/23851089288.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210913_155156.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/53998466877.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/98789331806.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/xulosufakawadarunikamiziv.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe7c6fa05---kikubulagefur.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/16138511085.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210916113406.pdfIn PDF document text
    • https://foulardfotografando.it/file/8626603576.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 11040 bytes
SHA-256: 5cdc3ea4654710ce5dca6c6f03ce9749604c7292d4332a6b4985d6ad574e47cc
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 17428 bytes
SHA-256: cd010c68707ddaa41e49e69cda9f284974dd66c62b3a17c7c246d560d1602681

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