Malicious PDF — malware analysis report

Static analysis result for SHA-256 483ba0bbd0961e67…

MALICIOUS

PDF

85.3 KB Created: 2021-08-30 15:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a0965a88fd7039138709551b2c777541 SHA-1: fd416a79389e203695bf1b76362c88fc8e16810e SHA-256: 483ba0bbd0961e677ed35c02b5ce38a9835bffb5e8919899b312d63a8cdb6157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mmszke.hu/files/file/debikenezidozijolij.pdf In PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/sataxoj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d97767f3627---wajajuvijepupig.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/94010891121.pdfIn PDF document text
    • http://air-con.ru/upload/files/41295139396.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/62719873794.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/laxarigupopuju.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/29/25709016792.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/disinisuxesepipi.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/ratuxokodixaliwusebopub.pdfIn PDF document text
    • http://valeneighbors.com/userimages/24737914553.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/60872717442.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/90286524002.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/34596161602.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/wivune.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/953078467c1b45cb1ccc46720b59f670/39957556393.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/3158755335.pdfIn PDF document text
    • http://hongdacable.com/d/files/78682136997.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/roremog.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/tatuturepunudirexuxuduvum.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/73204031366.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/24827091420.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/nunebipogo.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/bekutefoxepubosupek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=merry+christmas+2020+images+freePDF link annotation
    • 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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 17988 bytes
SHA-256: b7b01cc959081e7d6957d59b0ad1a4843dea35e23ece75e00e7bcd9f7ea1ac0e
font_01_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 10860 bytes
SHA-256: 0232825c2cfafcaac99d479da1d71584cf06fa678b5732953067824a48b15c90
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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