Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30a452823f5bed6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 15:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24481da8ded96de02f8704062e807838 SHA-1: 6fc27e9d5082f8958983f149a4bafaa7021577df SHA-256: a30a452823f5bed6376dd6ef1078c7e56ab3a9dbd8d61e5d50cb053b049457d8
146 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a spearphishing attachment, designed to redirect the user to potentially harmful content.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=hack+pattern+lock PDF link annotation
    • https://metnar.pl/web/uploads/files/bofupezejufizugorodokitu.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/22360507584.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/vededevuvegowoli.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfa0a2652---97531619567.pdfIn PDF document text
    • http://vit-physio.de/file/73871476026.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/59799929641.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/85641507682.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/49857443336.pdfIn PDF document text
    • https://financenetwork1.treasuryandfinance.info/userfiles/file/fuzuzomixububadakatatizo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5c041080---51719284783.pdfPDF link annotation
    • http://chamdure.com/DATA/files/zilorilip.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/898039378.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/29132784041.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/91388166972.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/34081834961.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/1562663633.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905193414069.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/25192669198.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/61094482338.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/95763910711.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210904032713.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/5317203015.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 17308 bytes
SHA-256: ceeceeaabfe9867a0ccecffdf6ad29a898e8fb99cca49441f0afaf38781d5ab7
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10188 bytes
SHA-256: f217a1568c5e8f8af56cd5cf575725c2cea9cdcef772fc5a49e6a098ea52a813

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