Malicious PDF — malware analysis report

Static analysis result for SHA-256 6695f3ce3f4c6676…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 09:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c50027c04e1ce71f822b0114dd877141 SHA-1: 46ac7bb606c796bb3982945fa1980b5190bda4bc SHA-256: 6695f3ce3f4c6676acdbf69486970f84a4663801052bb7ca8010d8cb89c34692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, with one prominent URL leading to a site offering 'best paying jobs'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://coretry.ru/uplcv?utm_term=best+paying+jobs+out+of+high+school PDF link annotation
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/78909630402.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/nonesuvozijabiwawevogariz.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/devadaxego.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/40371868231.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7akpetm09l9uthcsl5vkof8i1/64268151233.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/samadewifopiperefobabavas.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210929164402.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/34848216486.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/ligofalaginamerode.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/zafuz.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/84775986663.pdfIn PDF document text
    • http://one9five.com/userfiles/files/78038711447.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210921072246.pdfIn PDF document text
    • http://ametansk.ru/uploads2/44987334925.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/numidexekofupe.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/dekik.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/ditubegaxixilumimuk.pdfIn PDF document text
    • https://pecintajp.com/contents/files/21552796964.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/54686484179.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630909384.pdfIn PDF document text
    • http://ponozky.gultio.cz/webpagebuilder/ckfinder/userfiles/files/xugakamuf.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/34655623467.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/74172933652.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xobojatibavifibajirek.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/xudofubujopularunexerala.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/81060452927.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/61295683562.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/dobimarobixubodiw.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_off0000b316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 15184 bytes
SHA-256: 248c3a74f9133ce65410325feeaaa69c1ac8916a227e2c0e6b3b11a9a3f38dbd
font_02_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 11196 bytes
SHA-256: 148fea53cebf57daffd3739f645af72cbb15a6b5244e0c2c871f2974f65c2e1a