Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5078387a9f5b8f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 22:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fcef27a91dfc7aa1ce13f121cc167256 SHA-1: ccb56c61793504f889f7f94501224c3a251ea1ec SHA-256: fd5078387a9f5b8fabba3d9e28174daf3149c6dc32b3855443a8db878138f4c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=cara+block+ads+di+android PDF link annotation
    • http://verzorgingsindex.nl/images/uploads/36684864052.pdfIn PDF document text
    • https://bfull.ru/uploads/files/66525131191.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/710824098.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/62830277675.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614212a764917---waxejulipiwuvorumam.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zimejudafikazidovav.pdfIn PDF document text
    • http://373113.linker.tw/files/56470863264.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/muvobedemuwunikiwe.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/53275030881.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/85091896154.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc060d616---rurafixakoxafuja.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/54287542642.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/28539640138.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/fijivamezoxudafotonexep.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/zifepufumemirev.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lovurajasevutewaxirexaxep.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/66850174054.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/13472402576.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/zamokidikaxunorenazerelum.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/99781680618.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xokopivitexidabepuvemif.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/53696335072.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/kapozexemado.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/nerezujukasegokisiv.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10396 bytes
SHA-256: 7ced47dd4b9c2ee989940710b3528264af082c886413b59c08c2474421996481
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 18724 bytes
SHA-256: 8beee7bd43ad307e3725292e979833e2187c1ab7b82552b6a5bb4fa7ce8c0101

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