Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec65019c9c8f78b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 23:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e11b662a11feded5b14aea637dc3efc SHA-1: 35e2ee73dd74cba7a925fc1c50f011792bfdf086 SHA-256: fec65019c9c8f78b2d4f5a160f99ca87f41d0ca1e652e08aa56d213bcdc871db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests a phishing or redirection attempt to a malicious site, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4oehd99ddnuocj96icmvc17emn/40405048026.pdf In PDF document text
    • http://german-ex.com/images/blog/file/rufajibilas.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jotare.pdfIn PDF document text
    • http://podarox.ru/public/files/5994868947.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210908_8827E871489BF61F.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/baruzasitajaruxotu.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/90466477505.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109100843397957.pdfIn PDF document text
    • http://dhf-china.com/d/files/maborodub.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/10463827728.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/84686636302.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/16365137239.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/73311408839.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/94888027559.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/92535974249.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/7515039005.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/xogaduzekejamexil.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090413492973499.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/pilududiruzuv.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/niwegezopuw.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/ruvudexoti.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/84496997844.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/nefevokopevogupezudul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+music+android+download+locationPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 10624 bytes
SHA-256: f6833d059d62fb73987f591a4e5b4377dadac59df12c88ef7ab2ebc9296b0c21
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 17128 bytes
SHA-256: 293722e0bcaa0a348666a7cd8f64945ca039ba2e355ebc9347a48c64af460c1e
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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