Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc490723aab057b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 16:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3f3543fc890deaf3e357673ecd09d0f SHA-1: ff84cb0d1d46efe17bfa15acb6a76da37c4d93b3 SHA-256: edc490723aab057b99281796f5e19116e425e37c74e7e69032525b7c06f552ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful 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 https://drafthe.ru/uplcv?utm_term=action+1980+movie+watch+online PDF link annotation
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78369940661.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kalawemozonasifudak.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/raxonurisofudalibogejiz.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/83727438932.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/vuzaxosodakevowelupuve.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfacddd68---64697058056.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/6498730476.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/50477715959.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/24504514043.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/sigimegereze.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/tunamabaripabesuvewupow.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/runuzuxuvezur.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/nokesez.pdfIn PDF document text
    • http://ingore.cn/upload/files/80249678247.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/53881228292.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/24324421439.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/49008387685.pdfIn PDF document text
    • https://lorus.rs/files/14629988431.pdfIn PDF document text
    • http://wsm.hk/images/files/zevunapugagisufiseduw.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04150398---17437794362.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/6776302702.pdfIn PDF document text
    • https://fivetc.net/uploads/files/70982465653.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/36233979852.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lefiviwizewukejuzasut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 18032 bytes
SHA-256: 728613785e55b533d5236472f23e6ecd170d8a361f1625bf8cc30b6808de59a3
font_01_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 10908 bytes
SHA-256: 5a6984dac298ca12b8e67f596e05e5f9167f7268c9b2c5d4ea655f7338c68687
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1