Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3d87901ed38ef6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 05:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81a133bf5ce7feefdad3bb4882a34796 SHA-1: 7c903b0484ec64200c6bd96cd2d0cc89bc95ce70 SHA-256: 7a3d87901ed38ef631ed92b2b9408ede4a3f62645f1748113c7fee8eb0d9e94f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to PDF files hosted on various domains, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.jobibon.com/admin/userfiles/file/46083471337.pdf In PDF document text
    • http://iglozawiercie.pl/zdjecia/file/12901180716.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/wususojivojome.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/58712477964.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/bozanaf.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/86053537385.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/doroxefivofabi.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/kexatuxuwufewizokexawilo.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/55030314535.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/40636734301.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vovikug.pdfIn PDF document text
    • https://afayl.com/userfiles/file/wixoxitarosetonel.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/97111706039.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/juwedelubufojemepugapi.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/79255514224.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/74739480813.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439c6b8ff80---besixetufo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/miwavuvuno.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/11368935419.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/32832702198.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/27968267524.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/77436588194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sync+office+365+calendar+with+iphonePDF 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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 17248 bytes
SHA-256: 4e4d8f6b2fd0411922979fb3763296dca1af1e0d2ea4b97d14d322b5a15762bb
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 11296 bytes
SHA-256: ce8544fdda18219471e0cdc3ecae6959875f835b35c2ff027cb66eb14537ad33

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