Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75008580676e96b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 17:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0ea7c3e814eb51066744bbd1cf452c2 SHA-1: b5d1920a13a7058b882a82fa6b9d83f23275bd35 SHA-256: f75008580676e96b8069a7809cc180a147ab9c010f404de3b5e6b7eeb9faacac
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a remote support tool lure. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs indicate an attempt to trick the user into downloading and executing a payload, likely disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://laborke.ru/uplcv?utm_term=android+mobile+remote+control+app PDF link annotation
    • http://tottazo.com/userfiles/file/57291127153.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9aa7729b9eba7fd6c23237b8c8375597/tuven.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/wejejibilowutewe.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/wamafamonodovikeme.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/87406584440.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/lojifamo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161411424a18ca---78065538789.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/28082404795.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/bajupadasexixez.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/12503086221.pdfIn PDF document text
    • https://aspirans.com/files/file/29975930909.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/79511156326.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/zotetu.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/47185440451.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/53163472715.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/50233133669.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/24817830140.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/57789031171.pdfIn PDF document text
    • https://path.mn/userfiles/files/23671515791.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/lolulonowowoz.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_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 10628 bytes
SHA-256: af1b99da1d6f5605ae4fdda6fe7f7706ce13c5bd2f5ee9561f71bbce30099f23
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 17324 bytes
SHA-256: 54c115fafbe36c1d9df7aa903be08aa57016b7221d3b0a50b447eb0e3f35d839
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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