Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d4903e895be16f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 08:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4c4194f49399e10affd12b8e65ce72f SHA-1: a67d987f1c9aba51892e4ddfdb862f0c80be7bec SHA-256: 75d4903e895be16f3f4ade4717df6230360b988feba3fecaa2e39ec4148b6f71
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, indicate an attempt to redirect the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ambulatorioveterinariosantanna.eu/userfiles/files/sexepefala.pdf In PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xubagaledamibobazixukasum.pdfIn PDF document text
    • https://cardolf.ro/files/8395893503.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/zulokuwerexizexakaxasugoz.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/renofuboxenavune.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/66521005114.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/38603689673.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/manureboza.pdfIn PDF document text
    • http://freeorden.com/media/file/64476413552.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161360292be059---17845621566.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210914_E69714BA532ED855.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/sigukax.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/34607495479.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/fuxomal.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/lowedoxizeleduzizotadixo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gaweg.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/74509835618.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/54706055516.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/dimugib.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/notimus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=photoshop+cs6+tutorials+for+beginners+pdfPDF link annotation
    • 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 11308 bytes
SHA-256: 1f2ce834ac06e5f6d52129d4b042332bc43ba636a071875bf41621f4c5234a67
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 17788 bytes
SHA-256: 70b3ef9b20abac816af180a36248ff8afd48d50a3be5cdf4ffbf41087224882a

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