Malicious PDF — malware analysis report

Static analysis result for SHA-256 812726f4cb496e8f…

MALICIOUS

PDF

105.2 KB Created: 2021-10-05 18:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e97a459711a5d021b84ab67cf199539 SHA-1: cd3b91f8d1c90e024ba6496f4a8ddaa2c78612e7 SHA-256: 812726f4cb496e8f9e3812f495cee97fcab902a21998457b835bee36c2d985bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to PDF files on disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://garglob.ru/uplcv?utm_term=quotes+about+being+a+child+of+god PDF link annotation
    • http://aolisenjiancai.com/data/files/tijesisokerozoperum.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/pipaxofudemuwawodegoxu.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/kidejadiwuwuvixodoj.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/popoxopejofofilud.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/legojozodakazog.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90616647751.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436d02b3945---85392254540.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/lovubub.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/37471549164.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/zezafupodere.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631015142.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/34376488996.pdfIn PDF document text
    • http://sdes.in/uploads/gemis.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/41513582944.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/75132144827.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///beboba.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/mowes.pdfIn PDF document text
    • http://boldogelet.hu/media/pogove.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/mosoxitujeti.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/7614623309.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1605778548613a72b553ef5.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/84082735076.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/48245968010.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/tuliraxenubab.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/91371171126.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/zogulegokomatidejaka.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_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 10956 bytes
SHA-256: 0b41f179c862bcfd59ab4f2f24f350733ee0edec8c227cbf58c325898a456ffd
font_01_sfnt_off00014ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C4 20076 bytes
SHA-256: d1cbad40fbd1e5079ad41ebb4ac04f116122d19144caf20d133e73961835f29b