Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aa9576eac7ebbf…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 15:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ec8f8de8d64deb3b7e8337136e98b9d SHA-1: cb3e3941602aa8a53f0c7f71d6f977619ef8fa55 SHA-256: 23aa9576eac7ebbfe41882e1fb74515944607957aec0e365df29ffa2d21cce25
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to a raw IP address, which is a common tactic for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URI heuristics suggest an attempt to redirect users to malicious content hosted at the IP address.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ka-base.no/images_content/file/peluzikodav.pdf In PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/fitolo.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/dodobukekirukilejazivupu.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/moguvotusotewosogezoforu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e5b1c64e---nuravokedax.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/34669939643.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/mobupozonap.pdfIn PDF document text
    • http://erpos.sk/data/files/3900777928.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/xubibixosojokudizise.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/26412410520.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/muwijujalulagizekazarip.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/gemikalivabuwafaxalus.pdfIn PDF document text
    • http://skncn.com/u/files/86889453912.pdfIn PDF document text
    • https://rinducm1.com/contents/files/zajabof.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/kerukekumolanugedu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/61219545622.pdfPDF link annotation
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f322d2de33fb650fbf6b3ea0f64d81a3/dawavusozeliko.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/82101010504.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/49555165435.pdfIn PDF document text
    • http://plncse.hu/php_data/file/19671070541.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/vevakapisijabale.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906081008.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/74102874620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mad+max+androidPDF 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_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 10060 bytes
SHA-256: 1eb293b7a9ee3289eb13a6e7c21df338e7deed58babbc0a5bc4af62c0ef47bfc
font_01_sfnt_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 17868 bytes
SHA-256: 65e4bae2b44c38cdf1b06432206c037569b460e0288f83a1872164cd046c1025