Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb23e637715afdba…

MALICIOUS

PDF

74.7 KB Created: 2021-05-06 08:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 174577b695e011f50a28abb9acc74e4b SHA-1: 194f10beaff2c57a6bcf77aa6724bfe42fd8c2d3 SHA-256: cb23e637715afdbaa1234c84a2cee9cfb5ea10152932a6a91b8bfa4edc036e44
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=como+hacer+documentos+pdf+en+iphone PDF link annotation
    • https://cdn.sqhk.co/takularozo/UiggcAZ/75927621169.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/adventurers_wanted_book_5.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/add_extension_to_chrome.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/54634487731.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/haIiajf/xatonujosawap.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/jjgQjeR/vanewudasufasexozuz.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/8604721.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/f2c64ef3999393b.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/pNVWBTk/82967020054.pdfIn PDF document text
    • http://purpless.vip/46437791279z0w3b.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/gjjgGhj/journeys_interactive_series_download.pdfIn PDF document text
    • https://cdn.sqhk.co/puranajav/haG4gdk/jinatuleb.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/37b79.pdfIn PDF document text
    • http://boldly-grow.com/72496889030g8ekh.pdfIn PDF document text
    • https://negopipeminote.weebly.com/uploads/1/3/4/8/134885603/3c8b18df0.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/ghrLhgV/48903812243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tonorepunad.myartsonline.com/bescherelle_franais_collge.pdfIn PDF document text
    • http://bedopevidorofi.myartsonline.com/nevidotazadixajifot.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 5268 bytes
SHA-256: 63bb2a905d4c03207f2129eebfcaa544b261b69796b763920cd113586e66a6f2
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 11080 bytes
SHA-256: 0c0a6c5cc4ba9fe2b340cf59dbd50aea11cab437057e5af759da931435c7fc06

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