Malicious PDF — malware analysis report

Static analysis result for SHA-256 52452a6bd5255476…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 06:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c379309437afadd1855d3d15d243755e SHA-1: 18105fabd6d4075b63044a6b75bd502b11da887d SHA-256: 52452a6bd5255476aece14fe8b77c001126bdd0ff981cabc9f65a49544ea9465
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external PDF files hosted on various domains, suggesting a phishing or malware distribution attempt. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of linking to potentially malicious content. The ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=car+eats+car+multiplayer+mod+apk PDF link annotation
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/zoridafitedakanobo.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/foleburasokojeni.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/fitadijitedawalo.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/97327726149.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/40388595533.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138423a49940---94881969383.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/24788615004.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fuwebilelikusomanun.pdfIn PDF document text
    • http://gyliver.ru/files/files/39813958021.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397aa5afcde---segirop.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zotawisuwu.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/14570329003.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6142EFD7CB846.pdfIn PDF document text
    • http://signauction.net/userfiles/file/visizem.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/9803080089.pdfIn PDF document text
    • https://emenu.hu/editor_up/62393603294.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/82198467909.pdfIn PDF document text
    • http://gaudi.tw/upload/file/68316549794.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/59337599981.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/1556767460.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/dizulerimirogexijatotasat.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/24154312188.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/siwikibu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xuwonuwubudaroduridojifo.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/meriwan.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/zivepasas.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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 10908 bytes
SHA-256: fc901997b20dca4be6bd41b278ae7fa3595fbe7be092b29d2ea0fe3f8c35b65a
font_01_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 19232 bytes
SHA-256: 67b3d6c6babae9bcc31eda29f61edc2a7de306d0ad3735e6666b8268a6d5fa36