Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9ffacf369dab34…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 19:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 432d436eb4c1917ec9a6f1cc107fec45 SHA-1: 02fc449624aa95a706006069bef99b2517c2fc2f SHA-256: 5a9ffacf369dab348a8bbee38dabb5d85b958034ae886eb8c08508cb51bdd679
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering further malicious content.

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://smidgel.ru/uplcv?utm_term=video+editor+application+for+pc PDF link annotation
    • http://www.firengo.com/userfiles/files/sabagedekadow.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/dazidonafojubadodinuj.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/xewerozigovaboxeta.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/57754989951.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/vujojulunikugo.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/9168287388.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/10082037236.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/najikoguxuwazogon.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/misukep.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wekijuwavusi.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/88259984792.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bomozar.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/zejetuwuverikoganaseka.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/voxuzalidab.pdfIn PDF document text
    • http://dytac.hk/userfiles/81191419077.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/xivosowumosavureg.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091401404899.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/zanusikipasolije.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/69726785736.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/wamutev.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pifakujunaposipoteguzodum.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/59046198865.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210910_201145.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/gidujiwawakawimasodal.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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 17672 bytes
SHA-256: 1e0c6dfc4384c81f0983883a0bed9647a56cd1662989902eb37d64fce6dfccd6
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 10412 bytes
SHA-256: 3f12b0d86775c5ec34adc1bf3644bf9e3ebd0bc6c1a7e192aee15224f735ab9c

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