Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e160dd8a3ec4247…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 08:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76e5f1b79734aa423abe58da3b6dad95 SHA-1: 6750d1dd5e84872df655f22b6f9688b77d68888d SHA-256: 4e160dd8a3ec4247fac95857f9b7ec12e1b76a8b571ed3677ecf2c7a8d1df2de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF utilizes a link farm technique with numerous distinct hosts, suggesting an attempt to obscure the true destination or distribute malicious content across multiple sites. The presence of many unknown reputation URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lecostationery.com/files/file/57930091651.pdf In PDF document text
    • http://mweb.cz/images/file/2340838877.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lubonojaxuzevofe.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/subolubivo.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/69921384260.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/pitaj.pdfIn PDF document text
    • https://12shio4.com/contents/files/85867117398.pdfIn PDF document text
    • http://eric-parnes.com/ckfinder/userfiles/files/jupatob.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/fogiwavodogusotakijav.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/vunexomidoj.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/56960772676.pdfIn PDF document text
    • https://salonrewards.ca/images/file/99274854476.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basitozedavezupi.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/pigusaxonisalosunutozuv.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16133470f4d6b6---85053394002.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/75961956070.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pedorewiwepejatizogaduf.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/71875113931.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/rajiriteseguluxaga.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/vosajogimeronubu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/57421390389.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/16044163421.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418f7830256---93828692730.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/66460382109.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+dosbox+on+androidPDF 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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 10616 bytes
SHA-256: 9095ad59d07d08e72cf7098c89054536a022434ebb52289fc92a550ea58c7a90
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 17272 bytes
SHA-256: 9cbaa9d990acf06d5b1d133fd0c74a69925e3b3354bd6ee9a56ade2096918930
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1