Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd956c528991ac56…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 23:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26af2b46460eaa5f15b1fcb8f34ec15c SHA-1: 8797d1421e43a304da0d5e360f86af92279e596b SHA-256: dd956c528991ac56c17089eef7330fe81b834642ffbfb2116492f52be8dcd190
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous embedded URLs and a heuristic indicating a 'download button' lure suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=hack+diamond+sniper+3d+assassin PDF link annotation
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/49175266219.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gijatomamewip.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/bunetuxumurakijev.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/12085807335.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/7381129816.pdfIn PDF document text
    • https://led7.ru/file/61235563218.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/36362670283.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210905/files/20210905013609.pdfIn PDF document text
    • http://orthopediedelft.eu/files/pedasupajemiponemozebapan.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/67923779510.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/vodexudumigirofevotakete.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///84198895153.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/nulorewo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/29174138801.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/14069947631.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210907212442.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/49640518585.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/40577308109.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/banotetasorovut.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/vexolaxewuzuxisekavume.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/78110060802.pdfIn PDF document text
    • http://duef.ru/public/file/mupox.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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 17612 bytes
SHA-256: 270327750905d58dc2ecd223bea0e4bd02ed444e26f672754c78493e1f81712e
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 10788 bytes
SHA-256: c181fb1a00940e7855d10e83940cb1c745cb4fb204ca4e56326c42bac660f652

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