Malicious PDF — malware analysis report

Static analysis result for SHA-256 305a39d16fdc5508…

MALICIOUS

PDF

82.9 KB Created: 2021-09-28 19:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b7bd8b4191f894e0c5cceb36bdc324b SHA-1: a26898f5f6642a1bc9fc99021d9f79ded3b35d23 SHA-256: 305a39d16fdc5508c5c178cedabf1f2442737853fa2784670c7058e84981bb76
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to suspicious domains and some directly to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=arch+manning+cooper+manning PDF link annotation
    • http://hidrometa.com/images_upload/files/20674421899.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/demozaseguvexuruj.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/99853260275.pdfPDF link annotation
    • http://aktifimmo.lu/userfiles/files/72285203986.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6c9ca5918---wizerifa.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/48540459124.pdfIn PDF document text
    • https://bauarch.bg/files/7476849348.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/bowezakonezitesep.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/43671431200.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tevolizidafukaduf.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2031301975614f8ae4659cc.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/nubopuzulep.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/56325987180.pdfIn PDF document text
    • http://cartopack.be/Images/file/zikigof.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/17790181982.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/38786896947.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/40018812233.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/zuzateze.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/vokajesolologovi.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/59421314148.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/01829941c7a88e4fb9077a3b11148cf4/11147613610.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/99221523229.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC043 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 10492 bytes
SHA-256: 15238ff102ea0bb7f93203dce1c170b733932762c448d4938135982ceb652a1e
font_02_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 21144 bytes
SHA-256: 0c244e502ea7d5c6210c884e5ff9afdafbd50d295ce1c53f045b43097b262226

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