Malicious PDF — malware analysis report

Static analysis result for SHA-256 3334f18307278c4e…

MALICIOUS

PDF

84.7 KB Created: 2021-02-22 03:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf238842fb6e7d1d9e582beea803a63c SHA-1: 93f3e2f2eb50a471cb85efb13bab23bcb82df175 SHA-256: 3334f18307278c4ee0841bc0b3cc799fb5a25c60a24213a6a6b5c32619f32cbe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a keyword-based redirector for SEO spam. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to direct the user to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/wb?keyword=how%20to%20design%20concrete%20formwork PDF link annotation
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/pajode_vusokuluj.pdfIn PDF document text
    • http://soldatskaya6.ru/dell_optiplex_780_drivers_download_for_windows_7_64_bitemoui.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/huhd9ia/personal_sticker_maker_and_stickers_creator_free.pdfIn PDF document text
    • http://hookup756.fun/alphabet_letters_to_print_and_cut_outdua6g.pdfIn PDF document text
    • https://cdn.sqhk.co/kopubeno/Frhbj8N/waduzo.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/giWiigf/train_sim_world_2020_xbox_one.pdfIn PDF document text
    • http://unreguezff.rest/86223081335kx0lb.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/DwNMhgy/magic_rush_legendary_heroes_list.pdfIn PDF document text
    • https://cdn.sqhk.co/nikazurokuv/r0WLge7/fabukidakukuxima.pdfIn PDF document text
    • https://cdn.sqhk.co/xesagomi/ifWyDgc/descargar_pixel_dungeon_en_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/yhicYjh/80745468813.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/najubu/sejusos.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/brokerage_services_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/73905309929.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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 5216 bytes
SHA-256: d3a83f0ee09d709bbbcafb07269352a73dd0a1f7b0896fa455e8f49b63072d11
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 10960 bytes
SHA-256: 8139e045ce2869bf25c239028229f707d9a1fb5551d86d5b735c3552997726f6
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16136 bytes
SHA-256: 8d0ca5441952925faa6f68d28470995fcd5e3edd800b1977fac83179433ae1db

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