Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a75c1a039da4431…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 02:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a758627fc326d15ee7e377717236d485 SHA-1: 9bdb2c546965e8690e2a7d5859c2b1c159bfb9a9 SHA-256: 4a75c1a039da4431655041e46b9ff6755396199d7a9b5bbc69b3dbac1d544d0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating phishing and trojan characteristics. It contains a high number of embedded links, many pointing to disposable domains, suggesting a link farm or redirection scheme to lure users. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wonkingchina.com/d/files/67416771373.pdf In PDF document text
    • https://sakura-bashi.com/uploads/files/202109011926418147.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/64135604826.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nelatusolezipo.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/worigerobide.pdfIn PDF document text
    • https://coil.hk/upload/files/50541230736.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/vorev.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/12322206474.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12984469754.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/89101909359.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/55650838617.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/kuferefutedus.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/zaxamozikuxode.pdfIn PDF document text
    • http://methese.com/upload/files/pibesexobep.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/riboxusuwagesuba.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/61141875796.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/22111895055.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630526345.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/4717926213.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/febizewub.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/69263995503.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/24467081590.pdfIn PDF document text
    • http://ewtch.com/upload/files/xekomuzajesekodalozalo.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/bisotowifexeluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+103+a+composite+numberPDF 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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 11024 bytes
SHA-256: 60cf12c4e135da10e8d758620809d3435212d655f17ed18c3fac21e7a0dafaab
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 17516 bytes
SHA-256: b7b4fa2a6030cc21880820b37d9c607ff9e54dd2376a942e9898008fc8d17dde

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