Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0d57a1f03be32…

MALICIOUS

PDF

79.2 KB Created: 2021-02-22 16:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d24220887ad6d209fbf662897b0da1d2 SHA-1: de154270f8746b31dff44aa4dc6b0ef61c3c1caf SHA-256: 4be0d57a1f03be3264c1aa33fa441bc93033b6ebc41c796b3e86de50b9fedee1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://leonvi.ru/strik?utm_term=empi+tens+unit+price PDF link annotation
    • https://cdn.sqhk.co/dolitife/n8ggdr3/pixel_puzzle_collection_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/ihvIehd/gewuto.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/jbJ3yS1/epic_match_stars.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/a4w4Mel/48624886124.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/6ggihig/collage_maker_online_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/BieqPhg/gas_pump_card_reader.pdfIn PDF document text
    • http://tehnikator.ru/82172472747v1xqt.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/Ijd4gib/othello_game_buy_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tazurusubiz/jg0MjaU/hair_fashion_studio.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/1353409.pdfIn PDF document text
    • https://cdn.sqhk.co/wujodazera/s7R8idS/bandpass_box_10_inch.pdfIn PDF document text
    • http://housefashion.ru/jufixij2hyc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xojafemori/ai_green_screen_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/bandook_margi_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/38480184775.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
    • 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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 4792 bytes
SHA-256: c24a38196720d26e567e7a3b3e34fc98c3fe91087a1abb90e3dd642897bc5223
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 11408 bytes
SHA-256: cf2551f2b9f76e6369b2d9e975705b7ed68a6de84542ecf912fd5715173bc216
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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