Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c0083f67cfc5aa…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 00:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbe13feaf2788187cc84fbf0994842be SHA-1: 97f5b571287c480c89ed4187dad1a4b0df97f9d8 SHA-256: 77c0083f67cfc5aae1a235fe0b2104768d8dbcba4bc021d50e33713004124da8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lamelove-zakryti.cz/userfiles/file/77876327132.pdf In PDF document text
    • http://marjoleintje.nl/include/userfiles/68240326966.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/puligu.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/19361019545.pdfIn PDF document text
    • http://chicopharm.com/upload/files/wakuxolidonomubezu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/forezatapojenowulaka.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/jumaxosafudafekatosomefe.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/logererokirubiguzikunipab.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/dosukarefizufuder.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/jusum.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb441f5c2---lisatawoful.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nepajofumez.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/17732876182.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/18195092220.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/26776692262.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/zuzejadigazomuranur.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/77213845661.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/sezupepasuf.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/rofinubi.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/32879912060.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/begekovogavoranavemep.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbddc179e9---vofawumobimefiriw.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/tofuzivupepuzo.pdfIn PDF document text
    • http://asvpp.fr/pdf/gofobupoxokezukozewipodil.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/59484146773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+app+for+watching+animePDF 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://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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 18320 bytes
SHA-256: 321775528521b6485ff76b92814e1226d0b7efa2a69bd2632a30110fe007452a
font_02_sfnt_off0001330f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 10920 bytes
SHA-256: 7e50fa2c7b2afe2fec9d4a0a03f3f1ab16dae051163f717d11198ea269f0dc4b