Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f94f9208dbd6c5…

MALICIOUS

PDF

69.2 KB Created: 2021-09-09 12:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4a3caa5b512c4f4b1467dd7527a688e0 SHA-1: 8fe651f413b60d6b1f1de251aad69a00edf199e0 SHA-256: b4f94f9208dbd6c523ccf33c1cf798ba4e88d4dc211f574f8a767fc5678d14b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://artedeeducar.com.br/ckfinder/userfiles/files/26413310698.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f287339d3a---43942247439.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/92871366501.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/28704998237.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/gafib.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i43i9q2b10djra4f8jj32ks4k3/gikiz.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zusifatadonogopop.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/vegipudomike.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/sisamagojoperi.pdfIn PDF document text
    • https://adci.vn/data/upload/file/64866690168.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/xejazironibelagig.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wedavonowesubulig.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/73268908040.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vovorebewoz.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_073015_159.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/79617198865.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/87598935043.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/68191298033.pdfIn PDF document text
    • http://air-con.ru/upload/files/bemisax.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/2847505909.pdfIn PDF document text
    • http://keitbg.com/images/files/57053195219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nice+words+beginning+with+bPDF 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_off0000b111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 15064 bytes
SHA-256: e2bd92d16c07c1bc8e8c5660f9e1e3915e56a370215063f537dedaa87f439883
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 10644 bytes
SHA-256: 8f70e460cc2c17861cf21588648f1e2d2b338bc8f34e2ef5f1142e357258f0ba
font_02_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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