Malicious PDF — malware analysis report

Static analysis result for SHA-256 e642b097e10dcdb4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 06:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcffb4fae260ccba42221ac3c41295a1 SHA-1: b4a1b3c3d62ef949d92c1451a306b9cf9e82a9cd SHA-256: e642b097e10dcdb4538557d66798c02b239a42ec91b8b34ea3bb50d60310b890
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=watch+the+house+that+jack+built+online PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ohnq1fv5mcatpm00suotc664p1/8459824029.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/bixetinupikerezugu.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/51471321951.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/72108733596.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/74713662453.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/47136052659.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/pomujanigelinajedagibu.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/ramazaligixalozigiketodod.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/58952405672.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430114574df---gijederulisewozogew.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090310463039.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/23687260809.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/23793693112.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/wabemozosavoxexokub.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/2308965573.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/69544779582.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/86166452641.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fuzafeme.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/powekitupofasovorov.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/solukuxisotupise.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/tenoxuroseluz.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/22260657694.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23461563811.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/muvaxo.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/84472455167.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 18872 bytes
SHA-256: 46ae646bc3f83b9b5f3eb055eeeb0488fcce7f3992927534b71de91e5277bb2f
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 10680 bytes
SHA-256: 4340aea1667a6347a91a7e62d1affc94716d0f522699631888c590882a9e3abb
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1