Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7833ddeadb6fcc…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 07:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e61dbf276d5f923eb3b92325c021645 SHA-1: 8333b37d49ab2c6a49b6a6c4df264b24be99d7ea SHA-256: 2a7833ddeadb6fcc5f23ddeb2d8768e6529340e90ff3edec1b61f34c9480bf01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which are part of a link farm designed to redirect users, with one specific URL suggesting a lure for free movie downloads. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to lead users to malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=harry+potter+movies+free+download PDF link annotation
    • https://lensmam.com/userfiles/file/penuvapotok.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/92041583800.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kdkghdmlc472l8tpbrj6ah5op2/dosifagagunibapojuxif.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/53292696569.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nirinimowefivekirifogilej.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/61371096388.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/rafobamurofibusoribu.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/rulakufafixogunawo.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zevomi.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/27817410457.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/besedutelufosofize.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-18-00-00-45-10.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/zijupepixolevuvalub.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/golebabebumovixaj.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/71678383677.pdfIn PDF document text
    • http://glassick.com/userfiles/file/xolunufipuledolemosisu.pdfIn PDF document text
    • https://austarpharma.com/upload/files/jaxulisekexutixumenazobax.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/52594902781.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bisefulelado.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/44310787987.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/51532943550.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/xatunuxisobipojizisoj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fecdc29f61cad65fdf3f6360c000f0bd/kerip.pdfIn PDF document text
    • 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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 16532 bytes
SHA-256: ee60d963c08387e4b7a993603c1e7233eb712c47a07dbc5e11b28e3e062a90ca
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10916 bytes
SHA-256: 0ad58ed990bb1ee066f347fe68047baad8f3c8be0f3a39c9adee3ebdc51302b3

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