Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdcb469e05380c3…

MALICIOUS

PDF

80.4 KB Created: 2021-10-07 15:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3029e631a2eea25c8ab2f8d26b1285bc SHA-1: 1768329945e673c55794dbf82b7e6f21ca49d60e SHA-256: 3cdcb469e05380c36e84649c30a54ec024d7a0c74e44dba03da375dc66546dc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://controldellaves.com/app/webroot/arxius/file/lemeviwowiguzal.pdf In PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/48778573547.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/nipinuxofazolifakemu.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/mozusikovexorozeniran.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/sulagarovefi.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/xeruzisunupizog.pdfIn PDF document text
    • https://suny.cz/files/file/54130112517.pdfIn PDF document text
    • http://riversedgefm.com/files/file/4204039408.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/70607730725.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/8406800341.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/48453574364.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/bugawuwinetawonerobisuji.pdfIn PDF document text
    • http://vaithun.net/upload/files/suzoxivimiwagiri.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615ed2bb82e68---gatixudajozinupiwita.pdfIn PDF document text
    • https://beautydent.hu/editor_up/zakezulagakiwotew.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/dimer.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/favufa.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/nakodabeximezuneve.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/jamaropodukurujomawezomut.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/74827561263.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/65679322552.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/32600775431.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/76922791499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=properties+of+electromagneticPDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 10824 bytes
SHA-256: 4784042608150c509c1d52caf838ed5a2f2c36edc6937a11e50d77e429741fc0
font_02_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 18180 bytes
SHA-256: e3cee3bcc8033c32ce0a734e920fcbe9b7b750fc5420aab759c52d26ba990ea3