Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aafc19be0cf07ce…

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 13:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b2cd48075d2e52d6f1248bff6b68e2 SHA-1: 4071a672f24239b82d58c6263fd01b08ce1ecfd8 SHA-256: 8aafc19be0cf07ce0acf5a0ba6e9d686c2761fe70fabe6eaa699de44b9aaf05c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The primary attack pattern involves directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cameranichietsu.com/luutru/files/78801046490.pdf In PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/34697889081.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/1589247914.pdfIn PDF document text
    • http://kant21.com/userData/board/file/29903462379.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kofiwopij.pdfIn PDF document text
    • http://sun-eko.eu/files/file/16851779160.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/24221868407.pdfIn PDF document text
    • http://rajaunited.com/contents/files/zomevilitaxel.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jemaliri.pdfIn PDF document text
    • https://petala.gr/userfiles/file/xovid.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/98810962430.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161356e796684a---petelunarilatinubov.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/makotigopadepevixo.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/46657281069.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/67329173410.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/61778680147.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/49196760555.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pavubonirabog.pdfIn PDF document text
    • https://totounited.com/contents/files/jutalodarixowuxamur.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gemupagibinulopurezufi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce9cd07575---52332705242.pdfIn PDF document text
    • https://grancom.by/upload/docs/5979142741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=react+native+ui+managerPDF 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_off0000c1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 20444 bytes
SHA-256: 19d6411e97e5329e0d1cf7916f3c24ad5e7901619b6aa1143ae0af8c290bdb19
font_02_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10452 bytes
SHA-256: d064a56161fbd6acbd402c010df607ebcd6536f0457d0f4a87c3f190fadf29de

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