Malicious PDF — malware analysis report

Static analysis result for SHA-256 033e35f85dd820ad…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a0de221d82b31ad1845d1c8dfd3603d SHA-1: 49c8c93e38a57d5bc9beaf4e28e5b0877cae5214 SHA-256: 033e35f85dd820ad6c09a8964a33a01727c130c7176fda65ac1db48c32f89c62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous unknown URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/86133665327.pdf In PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/70706762161.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/xudixuluwixesilumefuwit.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/34440471090.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/73987466549.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/68769959609.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/rukafeboxaxodu.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109071202155862.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rexuxixijeziboxu.pdfIn PDF document text
    • http://ingore.cn/upload/files/39665598656.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/sufex.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/42519705691.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/15350073712.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/85838313715.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/kuvodupovapegowivo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/sijimesedazimaxibosubi.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/29909001024.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/45191135406.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/pakejix.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463533ac48f---rawebamabarinotufixigap.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/83692134516.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/papule.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/70760620158.pdfIn PDF document text
    • http://becucci.it/userfiles/files/75117382616.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/bulafamisiwesaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+messenger+pdfPDF 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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 17572 bytes
SHA-256: 1aff029073c0249409426849de560bbcab8e36f80714a47db6445c608cec3996
font_01_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10388 bytes
SHA-256: b8df12d0fa7793bde7f30cbb346743172cb760513408cb303994321163078a66
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1