Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bdb020e478fa84…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 02:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 2ee995edf10a8fc377fe85c459626dc1 SHA-1: c7cef8cfaeaec6bfd8eb454fcf90fd44cef5b87d SHA-256: f4bdb020e478fa840b91121c3591920a22f042ba2dd2efb29acac44642e4d52b
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 0.9976

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://coretry.ru/uplcv?utm_term=kratos+the+ghost+of+sparta PDF link annotation
    • http://www.nomorcantikjoss.com/file/82005933269.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/kusajavenil.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/96496187317.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wusemapesur.pdfIn PDF document text
    • http://unibox.lv/files/text/lemaxur.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/82538989480.pdfIn PDF document text
    • https://capecoralliving.com/media/file/pebiviva.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/88140539010.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/wuzivikadowe.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tekogirew.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/natisekolinuxewosatuv.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/73160126073.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/50999865106.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/53750609915.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/40421321078.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630961620704814794.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/13359120308.pdfIn PDF document text
    • https://novsport.com/content/File/66008151842.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/jexakosegutudoje.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/5145327013.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/76470040418.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 16420 bytes
SHA-256: c96bef9766ab22b30b3b8db5c34d51140ffd6c649c5e8b00827f7c6566f74668
font_02_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 10384 bytes
SHA-256: 06e7ece9de748e51b9203d0f6aff60da8fea93c423725ef74cf3c57554c1864a
font_03_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16496 bytes
SHA-256: aa3595da9a77a6640e02ebf276625b418a861bc2731109bea5ef55dc2a169d92

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