Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd59ae656d22783…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 22:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6707db67a073ebc6b962752eceba8af0 SHA-1: 181e2fb22efae5df1e16d5b38a456480763f5665 SHA-256: 8fd59ae656d2278323dc940b4a772f63f65f227c3a8c7f5b41d7111e52232e00
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=arcsoft+mediaimpression+2+free PDF link annotation
    • https://cdn.sqhk.co/kajurineg/j0gclhh/twitter_video_downloader_apk_pro.pdfIn PDF document text
    • http://urott-hu.com/graphing_quadratic_functions_in_standard_form_worksheet_1_answer_key_rpdpm3kjn.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/jg4GhfS/48302085472.pdfIn PDF document text
    • http://thefortykuti.com/9749391679501vz0.pdfIn PDF document text
    • http://gugibugud.mygamesonline.org/culture_media_used_in_microbiology.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/bhjhgBY/wrinkle_blue_spray_paint.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/how_to_play_goat_simulator_multiplayer_online_with_friends_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/xjgdhc4/4354032502.pdfIn PDF document text
    • http://pe50off.pro/breville_smart_oven_pro_convection_toaster_oven_canada5hq97.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/gfDjf0W/galaxy_watch_3_bands_20mm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_325d2eb3f524453b8b946c9b65e60743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/business_biography_books.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_3fa014008c4640c0b2b8577a3186b0f6.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_e758cc5d7238443e8993ec7b148de83a.pdf?index=trueIn PDF document text
    • http://junaken.onlinewebshop.net/42666829908.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_08ce9b6f360e48e1adbe51a00837a9cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/49273268442.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/mario_theme_song_trumpet_sheet_music_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/how_to_read_hayward_pool_heater_serial_number.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/4_pics_1_word_level_2263_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/tedudorebuselew.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/xomemonunitunejavomizo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 5176 bytes
SHA-256: 809e70b8145bb1a237cd419060c288cb9e7549329afdcb9c418c771a625bc4ae
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 15316 bytes
SHA-256: 60e06fc9fe5366abaf0fc6412404dd9a128a364851236795002983d1025c75e1
font_02_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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