Malicious PDF — malware analysis report

Static analysis result for SHA-256 249f620f462184c6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 19:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 11341c24ed355aaff07f530a1b05faf5 SHA-1: bbcf648ccbaf0bc2baa2b7b49068bfa6afcdbadb SHA-256: 249f620f462184c6e8e62f6488be8a5a1fe125fbb78747100a94bd0b4d51e931
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pistant.ru/uplcv?utm_term=genshin+redeem+code+march+2021 PDF link annotation
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/27366996570.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/29630588668.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/84293896586.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/kefuxesubekozogifuwoboten.pdfIn PDF document text
    • http://armanetti.com/images/guvutoxixanan.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/kalijerifawerukafado.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/27279441871.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/17340883183.pdfIn PDF document text
    • https://fong-cai.com/upload/files/garanujurubavokejifesifu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/tepofasatidumeluxudubo.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/nafevazowagasomek.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/nugomixenefuxobabaxiwejap.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/tazabetojanudinafol.pdfIn PDF document text
    • http://evola.it/userfiles/files/8693545364.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/79609862423.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/diganatipuxalo.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/lejugawebiwejederuxabul.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///25803335930.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/33026070665.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/xarobeketeleviremutitoba.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210911072144.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630537936.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/likikasobumonera.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/11848074163.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_off0000c1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 17464 bytes
SHA-256: 2b6ec93ca5ef3b86ec41dcd88f612acb6fd58b3620f13b546c754e7d23267bee
font_02_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 10824 bytes
SHA-256: 20952b2a4bc827fd3ead886aad529226718ae95cd1c2fa71f0e4388d7b74dbb7

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