Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f2d62649a0177b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 03:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81a8cb286d0d490fe15bd00cef25e6ef SHA-1: de59385462ac286f9e02dd483c396361677e85c8 SHA-256: 78f2d62649a0177be5c9cd56bb7ef5f317dba8dc9ec2961d8e72aa88339e8ed2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a link farm with numerous external PDF links, many hosted on unknown domains, suggests an attempt to direct users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing lure designed to lead users to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://meble-tk.pl/userfiles/file/30968270063.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/24704198351.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b1cbbef173092b92ca9aec8f2d4be5e1/mewom.pdfIn PDF document text
    • https://synersys.fr/contenu/file/79851628830.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///32683251508.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631393389.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/varitur.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/kemizududijewozorafutoxub.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/97198245038.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jebonaragexikanefosika.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/32847230512.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/41273189584.pdfIn PDF document text
    • https://kuepancong.com/contents/files/53008148411.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/25261219149.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/37303643975.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/22518779499.pdfIn PDF document text
    • https://baglab.pl/galeria/file/72405985352.pdfIn PDF document text
    • http://devveb.net/userfiles/file/xoxapetagipozikomipu.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/tepudezepovadexo.pdfIn PDF document text
    • http://dakov.hu/_user/file/zejenowusatamagabosuvuxap.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lisuxawiworodigebuwip.pdfIn PDF document text
    • http://biomehl.com/images/content/files/xuwekajulikixinozob.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/38936505705.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/23978642836.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f52407da0---jugaxejojogebukusufidokal.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/vamatesumikupurumenuku.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/dibamipebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mx+player+pro+apk+ad+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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 20080 bytes
SHA-256: 304cee1efcd27bbd6161b670caf68a530bcca393f94c8bc45fa4385708bf8440
font_02_sfnt_off00012b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B78 10332 bytes
SHA-256: d30d089842d69c7ca0570d876b536e48496e0cd2c4767a359f8e51393dbcb67b