Malicious PDF — malware analysis report

Static analysis result for SHA-256 901f51c4ab5fce38…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 18:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 296ba2fdfbbd887dd35a9183d4f09c98 SHA-1: e262c2590fbcbcd03dea91bbd56007499810c52d SHA-256: 901f51c4ab5fce38f4cbcccac8b1146de3c28d555399ff0f091c6bc10201cde8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection scheme. Heuristics suggest it's a non-clustered link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://coretry.ru/uplcv?utm_term=internal+thread+dimensions+imperial PDF link annotation
    • http://upsshop.ru/ckfinder/userfiles/files/vemekiniju.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137539b7a4cb---3353718564.pdfIn PDF document text
    • http://www.polni.si/Images/files/vatukumuzedudowe.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/mitozam.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/80000708411.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/86653167248.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14121944306.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/84995261961.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/dijitazojedosevolasala.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/menawagukixulimawo.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/wetazabewatewizitufotamef.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/numuxetitupetig.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/80542709422.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/geluvolokojelo.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/wisoserimiwalenemikaxoxaj.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/jupakibilosapu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/fudabegew.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/boxufovozavimave.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210910000206195.pdfIn PDF document text
    • https://bfull.ru/uploads/files/viriv.pdfIn PDF document text
    • https://abss.pt/userfiles/file/25987199632.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/lupepozaxewinojam.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10608 bytes
SHA-256: 84ceec1dfe0dfa74507121c17ac2ba6b5bbac193b7626bacb90c880cb9bc8938
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 17052 bytes
SHA-256: 2625b2d7906178a023ab62b1729c7d57372f764fc148c6b4b4e316babe4e2b78
font_02_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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