Malicious PDF — malware analysis report

Static analysis result for SHA-256 026ddddc6c665125…

MALICIOUS

PDF

67.9 KB Created: 2021-03-14 02:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8b8174ffe21353f71a6799bbb01677bb SHA-1: 82e161dde11655c4ae19f6ec006135a598b1eef1 SHA-256: 026ddddc6c66512576bdfd9c84b3337e6e2ec0f5a47fdf98b782abc8b0348f45
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to obscure malicious content and redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • 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
  • 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://ponafet.ru/award?keyword=air+force+paper+2020+pdf+download PDF link annotation
    • http://voxamuzovo.22web.org/98897164470.pdfIn PDF document text
    • http://hocostyle.ru/best_pandas_tutorial_youtuberyb8w.pdfIn PDF document text
    • http://silkhfig.bid/vikakijawuxuly5vqp.pdfIn PDF document text
    • http://boxberry-24.cc/how_to_make_a_banana_and_orange_smoothie_without_yogurts0r88.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/ihdVjeX/togetetunamababelozaketa.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/hggjexS/fetuwemozarut.pdfIn PDF document text
    • http://ygrash.website/giant_xtc_frame_size_guidecluf9.pdfIn PDF document text
    • https://cdn.sqhk.co/fasegibuniz/hewkbjg/56687228313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/faffd1ee-9db9-4e1b-9698-c4bcb6903bfe/apple_ipod_nano_1st_generation_recall.pdfIn PDF document text
    • http://neropalumej.rf.gd/xutewoboseputafuwukupero.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_d634dca9d3ae47ffb982615114618415.pdf?index=trueIn PDF document text
    • http://nezenomawaza.epizy.com/businessman_telugu_video_songs_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f647e687-292b-469b-80ec-9fc8213620ab/29213274485.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_db84950b1180453a9530f229338d0003.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6ee62f-c4f9-435d-b3fc-0995314ae989/where_is_the_fan_limit_switch_on_a_lennox_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dacf80c-c92b-4e2e-938d-d846275201d5/55203583061.pdfIn PDF document text
    • http://puwegobatove.epizy.com/13059605157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235fb31d-6aeb-4530-84b7-fbc105ae70d7/67454548672.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_c3a66ac6cb1744fda69c028d1d835aab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb1d878-fe39-4237-8de9-826b73b04d3c/does_kung_fu_tea_have_vegan_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b43ff8a-4485-4a61-b185-655d7ed67c41/where_is_the_closest_sewing_machine_repair_shop.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 5328 bytes
SHA-256: c77c5aaa203541bd43c7c075caefc635a3784062f55cea5b126d5923c3c1e2f2

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