Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbe7bb05fa4a324…

MALICIOUS

PDF

70.5 KB Created: 2021-10-16 09:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5c2bd7d0d13c7410caf2684c6dc280a SHA-1: cfa2695bf42ff07ef9641559a96404eb2b19648c SHA-256: abbe7bb05fa4a324007b5709a30331ea33b809d8145faf6bbab6b2d44c95ddbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, with a high heuristic score indicating it functions as a link farm. It contains numerous external URLs pointing to other PDF files, many hosted on distinct and potentially disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term_redirector' heuristic further supports the idea of traffic redirection for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://dytac.hk/userfiles/pupesakifaberid.pdf In PDF document text
    • https://dveropolis.ru/upload_picture/46442574533.pdfIn PDF document text
    • http://myslizdrave.com/soubory/gozemupirozewixavufutodes.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/96721290148.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/fesizekexijepowetesa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158d33f47f68---40188810866.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/35305596344.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/14419291355.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/1730962487.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/fitujovibosuk.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2m8kkjop4c9tbhdfhjbfnkidjp/42653484130.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/zevenesanoloz.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/70713172743.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/66731498688.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/42698485354.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/48146002985.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62239875868.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/43575072447.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/sofuditebibopusa.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/97158493603.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/17259760509.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/davif.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/basokunowe.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/20644023026.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/xijudabe.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/4541793634.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/fefupezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/Z3ufxtS7Wvw/uplcv?utm_term=gross+misconduct+meaningPDF 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_off0000b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 15156 bytes
SHA-256: 5f78ed7085fe3ac6f683b0bc18ffee77d568fd9a33522aa898bc34c28a94a244
font_02_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 10808 bytes
SHA-256: 671e5b990e804541ac5a6135ee728880aef0b149bf584b0d12158e4ae089f70a