Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ddbec1b9f15c6a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 02:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac5e4e834926a5dd716d4b35f2ec06aa SHA-1: 35056afe78538e55df3c09d16bceb1461ac22cdf SHA-256: c7ddbec1b9f15c6aa3b50fd066259d69a4de50f803c2734d6d82755e02e67cef
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The presence of a QR code lure further supports the phishing pretext. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=ebook+maker+apk PDF link annotation
    • http://school19-zav.ru/userfiles/file/kekoliziwefepov.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/pivinusejideputevuvud.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109042037555381.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/ridisir.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/10617894544.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/30511744547.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/purixewijovopokigopuvan.pdfIn PDF document text
    • https://adikkedua.com/contents/files/fetaxikodomujagutifewox.pdfIn PDF document text
    • http://benly-carson.com/product/files/77124767685.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/76055205753.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/16630438faba90a469eb8ad63439f711/larunibudaxililosiban.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/73667921491.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/zanek.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/1433602765.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/82714351543.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109170256291400.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/12177477268.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/kufiwuwoledokudizeleraf.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/079df1d07118de4496e2cf8c6aa8574b/pevitomeje.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/faneso.pdfIn PDF document text
    • http://semanbio.com/upload/files/piluvekezaliwuva.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109201719122361.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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 17316 bytes
SHA-256: 6a9eddb42d4ecc9e65f10de4e4c8ee66873699e88026a1970b116f9991c57ef5
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 10120 bytes
SHA-256: bdd7788df12caf66990605ee64bfae5e7832d37a2b51f17bd0887d0673b8a8c7

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