Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d0ef662388ebe6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 01:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13fe0224389487cbf3f20aea1b45a9c8 SHA-1: 737be09a856de26043292057b7274b76e3fc87e3 SHA-256: c7d0ef662388ebe6d7a0425c76693de3c3b2906d215e32fa7eca9549b8931b88
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying a link to an algorithmically-generated URL on disposable hosting. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure to download further malicious content. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=the+new+adventures+of+aladdin+2015+full+movie PDF link annotation
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/visavekikemamow.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gamosepurivadesonud.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210919_5080DBA1C1FF38E5.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mikugutipojolanidovax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9075a1ab0---8118670111.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/27970489179.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/49925156489.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/vatudowobigunutuka.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/lurisivakelupujo.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/jolesamekuwivutevawoleraz.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/16948930968.pdfIn PDF document text
    • http://podarox.ru/public/files/kefixijategasabimalok.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f192994217---jerejewibijenekunokeb.pdfIn PDF document text
    • https://ptogel1.com/contents/files/6556610847.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/wexevefitovixupenito.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/52729193895.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/titubusamesogafoj.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/14489858400.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/nozapemav.pdfIn PDF document text
    • http://mfahk.com/upload/files/dototigidumeli.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/dovusuvukofawotupiledagi.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/dubijajov.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/goluredunip.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 18956 bytes
SHA-256: 131c427358f14c5491fb499ff8351d5db4f64ca3d80d41f94e58ae7f54e64e78
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 11260 bytes
SHA-256: 0bccd1880aac56f23e8da65b5a84b03c3d6832d7e356ab37efb7c7597b6d7ca1