Malicious PDF — malware analysis report

Static analysis result for SHA-256 74316d8837080352…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 03:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d0073bd30b8b7304cbe3f2a7f27d9220 SHA-1: e4ac2c2b08a004883730819a8e04e6c7f4b03edc SHA-256: 74316d8837080352e2b55fb5ed9f70700eebae8eb8ab71dc96f12e77c9d40f00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The primary URL points to a download page for emulators, a common lure for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=download+emulator+ps3+android+offline PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ediopvbg1eu0r26cu844bbub96/bupujuxitakepekarikekuwev.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/labokumu.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/zonofoma.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/4902179811.pdfIn PDF document text
    • https://ms02bet.com/contents/files/rotukedi.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/7941926414.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/12161738738.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/ralexexixuni.pdfIn PDF document text
    • http://agilesolutions.in/uploads/38988911376.pdfIn PDF document text
    • https://digireg.cn/upload/33684632846.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/7162401586.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/82150380263.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161449c0180ee7---rawafijupixeritubixuzena.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/vagamo.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/30336231191.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/85919523207.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/62948911558.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/34761582330.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/56803788551.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/86832671423.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/47065545659.pdfIn PDF document text
    • https://mollis.rs/files/91694376882.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/24347386680.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/pategobunalutinomerubusa.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904033036868275.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_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 14900 bytes
SHA-256: 5d7872996605b5ea0669cc2be9c854023229139e44b8ceb0d2804bf9a73b0374
font_01_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 11016 bytes
SHA-256: 61a4b5e253161c32841ff28bf5ce0fb6932b1d004b5a825c166a0784e5012e26