Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da510b6785327f5…

MALICIOUS

PDF

76.8 KB Created: 2021-10-11 22:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf575fc7d5c061a29f0f17e64a7c3d2d SHA-1: 9224ca184c3246406bfb6152342a8d697a881b36 SHA-256: 7da510b6785327f59a912f00a0a17b9eb633385bb229052a13cf5ef58581a8a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like behavior. The document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://bdprescription.com/ci/userfiles/files/tolebavesetalami.pdf In PDF document text
    • https://hometutorsdelhi.com/userfiles/files/bisewege.pdfIn PDF document text
    • https://masihpt1.com/contents/files/19908120577.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/29374588025.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/bigipovosepeb.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/18466541399.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/13673032411.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d301d7cb68---23036312536.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/sorafonoluwedarida.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/ponizogixepisikesivode.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20211004040551.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/39287348588.pdfIn PDF document text
    • https://theipbuzz.com/images/file/kepomujatekunavavogesored.pdfIn PDF document text
    • http://healthywithhart.com/res/file/88975297067.pdfIn PDF document text
    • http://vejwun.cz/images/wonogafigumitejazene.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/28612996341.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/6903464107.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jikojuvetijogalujebano.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/woneviximigaditiwagufowo.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/romazokeponugolamobo.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52421892349.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/30272521869.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/xixovaka.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1633006562.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zarutebejaxubozusitap.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=free+download+need+for+speed+carbon+for+pc+full+version+compressedPDF 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_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 17864 bytes
SHA-256: d9c38e9287598c046357f70980f9f60605600f9d0acfa7ff2a017c08c45ac440
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 11052 bytes
SHA-256: c276cd9260b943f5a51822b53cbed4768d308b4b4d5907aac963b1bdbe1801b4