Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb4164ac040b7a1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 14:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd0ee30c88310ba5bade536aae146ed8 SHA-1: 8ac8ab954e5df33139dea5d6d6db021464465b0f SHA-256: 9cb4164ac040b7a1ff71da39797bc7efd5a841818d044646f30ee5f3ee89f1b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, suggesting the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+to+use+phone+to+control+firestick PDF link annotation
    • http://kovovyroba-nosniky.cz/UserFiles/File/sufudowu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/rinufugo.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/xomalo.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/6200230095.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/27248181882.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/siwazivizijekuwuv.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/14192071228.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-11-11-10-46-34lk8940.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/89546777818.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/raminupofepaxigan.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kokovadek.pdfIn PDF document text
    • http://uchid.com/uploads/file/5776675665.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zatezajazabaruxid.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqcpgt8t1hbh2q6s5ughn2d0gq/56049920316.pdfIn PDF document text
    • http://innotack.com/userfiles/file/70657583887.pdfIn PDF document text
    • https://doitoutdoorz.com/file/3GDkfFXWpVCQqDzm.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/81872720623.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/78954668756.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/rudilidakovup.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/98743148569.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/65216916562.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/30383721489.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/18203019409.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409181b01ad---kelisipufokeneras.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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 17644 bytes
SHA-256: 576144352aca69f36ab276abc206d2b7e1e3b5112ab16030d16316104253ef58
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 10684 bytes
SHA-256: 3c17feace86bac61f94bcf783f3b6773909bd0d2b7dbf9ca1ab6cac57f3bf23e

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