Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f34f040b0d016f5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 09:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5c07fd881c6dc1a2cba9052a771d914 SHA-1: 20dc2f1c102030ebf77483e8c95f3f82ef00f379 SHA-256: 7f34f040b0d016f5e0fae2ff2849530b6fb08355079ecaa7c8d7b17fe2d0cd95
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, several of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+delete+apps+off+android+tablet PDF link annotation
    • https://ville-saintleonard.fr/pdf/pasexiwukusaj.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/22984221809.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32095078951.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lunolutarodiwoxivik.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/33179826253.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/pilox.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/febofe.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30712925223.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/letatexum.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/metivifomidumukunu.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/limuxavobiwanenuv.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zokogifobekoj.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003221011355.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/28007635414.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/jijononimosefi.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/92903851520.pdfIn PDF document text
    • https://hojoairport.com/images/file/fuderinofuted.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/57879459164.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe68047c9f---kudadaranowafuna.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210918/file/16319133865211.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/10029020877.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/palug.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/070e61659e75f5f6d0f0daac5b203fe0/56700520069.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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 10708 bytes
SHA-256: dd608230f9cafdd2e14706c1be7436e1328a38353b3bac2616f8101e9865dfd9
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 16800 bytes
SHA-256: 13ceea419e404017b923d1437137f19c75f9671f8270f77a31a6b5b1478cb511
font_02_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1