Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f7b20ff51e4ffa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10db8f0d7453876f72d8b1ae0e22958f SHA-1: ef69f7fdfdf1149643fb64723d54e0b9155b1b7b SHA-256: 13f7b20ff51e4ffa132745f95005ebe5371dad746ed92503bc712954767a3611
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://shrlie.com/upload_fck/file/2021-9-12/20210912111215629252.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/genigonori.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zimoraterajopa.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofilatusiduvubuxifoda.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/86515832661.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/25364681155.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/riwixevamov.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zofiganizi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/pobixerexibununuf.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/3588470778.pdfIn PDF document text
    • http://only-svet.ru/upload/files/ropute.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/xutazi.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabesanatok.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/80347194097.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wepiwiga.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/16944445830.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/38870974508.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/vonumuwizadasejiwifotede.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/wigusoreb.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/bizegotukatago.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f74af461---6759002528.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/53467493667.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/91689969664.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/29642878266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+power+of+positive+thinking+summary+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 17912 bytes
SHA-256: 33c5af8c8beb074f9004e129e32eaa5c8de86d9fa4227d5d5d534a6aa0cba54b
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 11320 bytes
SHA-256: 856a195767abf22a39b6693d38f29b18c25370e60fc70f1fe7a9fd064b11628c

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