Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a8ac8a9cf09c0…

MALICIOUS

PDF

86.2 KB Created: 2021-10-09 08:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8ba16de652eb729576698e7e23075f35 SHA-1: 26f23b467fc487b2d596a40649daa80e57474bc4 SHA-256: a45a8ac8a9cf09c049cbd31da271b92ae939e163f2ceaaf5770158359adbb3c3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the nature of the embedded URLs suggests an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • 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://gesema.com/UserFiles/file/10447924293.pdf In PDF document text
    • http://qamsar.org/userfiles/files/jupovusilitesarufajiful.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/29708395905.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xuloxoruli.pdfIn PDF document text
    • https://blugarden.eu/file/30026057474.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109031351147545.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109010902476026.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/ziwemugam.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/55506643141.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/69740141378.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae201a779---subawufuponudebufawo.pdfIn PDF document text
    • http://drtamerturan.com/file/19609110249.pdfIn PDF document text
    • http://julianina.dk/upload/file/nuxetarapilibo.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210927110032.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/77777412540.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-10-5/20211005155052584442.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/36660014039.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/nitarez.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/56870805988.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/22414673681.pdfIn PDF document text
    • https://melz-feu.ru/upload/52083974279.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614697a0c31cb---75715529691.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210910185305.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/44566334566.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/fevomevigeporol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+difference+between+unabridged+and+abridgedPDF 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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 19652 bytes
SHA-256: 26f492cb84de7d09c948b2757b4af81a4569b86914734c250eaea2292980abb3
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10908 bytes
SHA-256: 82799e84cd09b90094e07ef8404f49daf893ba6aefcaba5a5d0d23e2119082b9
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.