Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4257c8d7aa73de6…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 18:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 631a5ca6f77823a2dcdf7e45396d11d1 SHA-1: 9ef3ec11615aba44731095ba0a76f976d0cd8bcf SHA-256: d4257c8d7aa73de6b6921fdf58603cae1ce95917c56c7190a2b0cc11749a95f4
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=arm%2527s+reach+co+sleeper+sheets+target PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381547/normal_602a6bef6e977.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/ONiaoTD/24068981602.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/jdvYghZ/21370300588.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/ehcRWy0/world_of_warcraft_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/ieijSjj/wallpaper_of_word_suman_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/l2kifje/off_road_car_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/F1yijGA/66892461809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_6037a38001c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602a37ae6c760.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hi8iejg/reperixudipeledi.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/Bjalasw/70377941074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/cisco_sg300_default_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115056b-739e-4ae9-b053-5f6aa18f6aeb/maytag_fridge_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c90f6c-18a4-480b-9462-eb9a0408462b/troy_bilt_pony_drive_belt_length.pdfIn PDF document text
    • http://fufebelanamug.rf.gd/baal_veer_episode_wblog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6484e9-b55b-4f08-9905-f35161e5a874/favibexugufesolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429645a4-b457-40ef-8848-a5ad8e04668f/ritetemp_6036_touch_screen_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7372a5-d2fd-4fd0-b92d-5f8a1222d7b8/how_to_get_viper_alarm_off_valet_mode.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/29802340234.pdfIn PDF document text
    • http://xuwomotibinifen.rf.gd/architecture_college_magazine.pdfIn PDF document text
    • http://nevozabewovezo.epizy.com/37372154277.pdfIn PDF document text
    • http://wegoxoxajenugol.rf.gd/costco_nikon_d3200.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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5372 bytes
SHA-256: 1095b330e1bb036694414478407a5035b2f914f77bcd75823c6f353c69197a87
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 13984 bytes
SHA-256: abca9867d43c5371d03ce922d755aeca393c29a89f3169237b5f13549ce6fbbd

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