Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b69abe25e9f4c7b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 17:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7bffe1c5a1fb9efdbb7f42fa622ab788 SHA-1: 0cf80c4d5d839f8f1dedef1dbe05b3c7108ef556 SHA-256: 4b69abe25e9f4c7bcaea33a7b3d319d731e9a4a922c3d741d263f95ac5ef46fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded links suggest it's a lure, likely intended to lead the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://toppelletmachine.com/d/files/39819867315.pdf In PDF document text
    • http://dpnovelty.com/upload/files/tewujo.pdfIn PDF document text
    • https://obrbikes.com/files/files/96332216955.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/68477232706.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/berisuwipifukaremeziluj.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/vafusolafemap.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jojutaromega.pdfIn PDF document text
    • http://boxethai38.com/upload/file/85974134411.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/wojavigalikobuzazeripon.pdfIn PDF document text
    • https://ntc-container.com/upload/files/28253517935.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/5696091536.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/26536272763.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210918114621.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sajuxuwoxejumufovelafit.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/katironepikutolox.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/dcd384e2b63d06d159160f541c5e5af3/kubizemixirerajidewalim.pdfIn PDF document text
    • http://jar-ted.pl/file/ferejetugetilisudapun.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/89333931892.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/regawuwa.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914052202448730.pdfIn PDF document text
    • http://www.polni.si/Images/files/kakutuduvo.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/53229004519.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/25523486632.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c59ef39e62---nuwibavidiv.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wiwixurisafidiwono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=carrom+game+mod+apkPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 17436 bytes
SHA-256: d36c837f58238a1dbf011a399e15bef0b033fa70a3d65ba1084153a95012f6c4
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 10352 bytes
SHA-256: af1cdfaac95d46c02eae4cfccec82e7c09f69808a5607dd41026767e8d8ab53e