Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae91519991cf1ce…

MALICIOUS

PDF

68.1 KB Created: 2021-09-30 22:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c41766c1cdad454ab0e4338c63e6227 SHA-1: 3392cebf1fc1c6646635b27633d72219b6156849 SHA-256: cae91519991cf1cec945e120535824a566d3e1c96b8af4bcca5cfdb3a645a448
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document may be image-based with an action trigger, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=best+qr+code+and+barcode+scanner+app PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d8569d6881b5a607a924989eeb66da44/lukowalaromukuwa.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/gusukododasevizoru.pdfIn PDF document text
    • http://swhos.com/upload/files/64658083203.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/razog.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/dobexu.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/40250042327.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/20203578546.pdfIn PDF document text
    • http://sbkf.org/files/files/44519704383.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/75285664377.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/27767916506.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/bewutetitabupejubugejov.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wixujaba.pdfIn PDF document text
    • http://elskenecologie.nl/files/44278189257.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/91599093448.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/40471149929.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/petujoredinidorudokomore.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144c7f0b6a5f---jiwuxiripe.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/jazoxevoj.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/fikaxapajesakakilijut.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/22385710138.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/dovepixanovuw.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/86843423657.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/zixulezoxemugiz.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zuvav.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/sexijim.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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 10708 bytes
SHA-256: 08b0b0755c31ffa2330a0ce6326f0b621df94a8b96e6c2c8f0e2f204681d8972
font_01_sfnt_off0000c80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 14052 bytes
SHA-256: c97da1f0ed716a6909ac2863d2d65a562f777fa35c92e1a466165f35ceec36b5