Malicious PDF — malware analysis report

Static analysis result for SHA-256 16186c223b99101f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-27 19:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c99fdf897564f2f9619a01f0b0aaad3f SHA-1: 7e2ebbf5b619a161369722bcbe5de89a08816cf6 SHA-256: 16186c223b99101f5337abc0ee37ade4aaa4151d3de99bef4af25023378a935a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic, suggesting an attempt to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as https://mezovuduw.ru/award?keyword=10+characteristics+of+an+entrepreneur+pdf, are likely part of a lure to trick users into visiting a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=10+characteristics+of+an+entrepreneur+pdf PDF link annotation
    • https://cdn.sqhk.co/sogefuluf/gcjeYwj/ninefudiwinazi.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/igcxhfX/thoracic_duct_function.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/ijicdhi/stay_alert_stay_alive.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/LOVgdQ5/nawuluforobinuso.pdfIn PDF document text
    • https://cdn.sqhk.co/jisofoxabap/iyhsCgh/free_ti-_83_calculator_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/gjihRuN/download_game_pixel_battleground_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/ibpCxEf/bedam.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/hHeFgdU/vudokubakinevuwakizo.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/efpphej/police_vs_gangsters_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495997/normal_6048330e70e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_60255eed5f053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ff97a0b7c3bf.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/elzjb8O/road_trip_with_lover_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/Fgjhfig/cnc_programming_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/hhic98X/fawiwaverudusuxorakok.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/8jd9giW/wetowamepere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60316a3eb7fa2.pdfIn PDF document text
    • https://cdn.sqhk.co/gogadibavuta/fzib3ih/mr_green_bubble_union_city.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_bbdb83cd4d6a40f2846aa1a3dfa1d70b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70bc593-2d00-4102-986c-e29c48452a7b/lean_project_management_methodology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd76747-3a1c-46eb-9baf-c7cf133da7d7/difference_between_p_type_and_n_type_semiconductor_class_12.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_96eeba1f8afa4993abe0a75b92c9f475.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_131935093bdf449f81ad03524fd412ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56433b0e-ce69-4e4a-a9a1-5f261a569931/mizerenazamoluzixeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89de5429-22cc-40c2-996a-a65acdc10cd1/where_is_the_starter_relay_fuse_located.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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 5308 bytes
SHA-256: 35886c0d6fd98e1b84d3799cea8319ff78fae2c163c02d19906781621303f4c8
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10520 bytes
SHA-256: 31bf93081a1b65227241ce4afab5d71141805e92f85c927a75fd30ffa3f87a5e