Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e89b41c7e974a30…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 13:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b81335d85ffa9848096a9575569f5519 SHA-1: 58f65adbf3bac61c76b2a7f1aea2759697c373cb SHA-256: 8e89b41c7e974a307d164e09f57c68ca2c824aabb0f8c78803f5d5e0f062f903
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and a focus on redirecting through UTM parameters, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ratosatu.com/contents/files/93016395985.pdf In PDF document text
    • http://proclima-membranes.ru/userfiles/file/29726782996.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/45502485034.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/71565938406.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/904884133.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/16503332368.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/30481407990.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/naxokazakalasezenofubof.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/wetesosufonasaw.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gikanegigupapumapoxo.pdfIn PDF document text
    • https://medtek.vn/storage/file/34950539011.pdfIn PDF document text
    • http://cabini.it/userfiles/files/kuroveliretupuj.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/vevakibobug.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109080944511588.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db502b05e9---39042993804.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/deviradijex.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/64760648471.pdfIn PDF document text
    • https://cartolmania.it/file/lejowovuwinin.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/babukape.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pekukugema.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/xebekusetukejafodes.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/65296204931.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/9150398207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=strategic+applications+of+named+reactions+in+organic+synthesis+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 11256 bytes
SHA-256: 0d06abfa63abd33c189874cdf0579500b1360641193055d49a3ad8f00e82b7c3
font_01_sfnt_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 16444 bytes
SHA-256: 847efb7851c65ac6b51e2a734c8ab20e89f36e8c383ce46006282da7c521b98d
font_02_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa

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