Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c1678f2ab7a5cd…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 22:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b8284ba5864c19f7f9e5808a434757db SHA-1: 4c9a6043f477bbe51ec9e6f0cf07f47c00d38376 SHA-256: 04c1678f2ab7a5cd35ab87e73bd541859c978e755bedec5834c949af1cce7227
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. It contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure malicious destinations. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://genegurumiraclehealer.com/userfiles/file/24356145193.pdf In PDF document text
    • http://ginzaoakland.com/uploads/files/safopurebiwijoge.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/libubomitewo.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/5759594568.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99599806921.pdfIn PDF document text
    • https://negaratoto.com/contents/files/gopezidejogofasana.pdfIn PDF document text
    • https://fultoys.com/userfiles/tawuwivorajafudijepojekuz.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/74448896539.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/fozazubefewetujadameza.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/61990057554.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/pabetaxupabiwubuxejiwog.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca70b0ccc0---81679680559.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/67510369139.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/labusinow.pdfIn PDF document text
    • https://petek.biz/resimler/files/99754289316.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/77116916603.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/88162960975.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/89834084031.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/suwesopixotofipizuw.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/44234327932.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8befee94c789a3404d50a704bf44be67/tixiligazagewure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+app+for+bluetooth+printingPDF 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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 17168 bytes
SHA-256: faea42614bc8a3a49dc736560f42035738f507229a27bc186c74a245089217f4
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10832 bytes
SHA-256: d3c7675e3ce83609b8641393f02dbed9b12902c1fe914534a91f1822be8b2fe3