Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36d58b8bc99693b…

MALICIOUS

PDF

89.9 KB Created: 2021-03-30 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d0d67c7bb000e12b2614d3a8b9a6014 SHA-1: f3f9552b1cb47a85e4cfec376453c86441d043a9 SHA-256: c36d58b8bc99693bb90c588b33ec08b3406dcd2b218e6a0b6d6dec03e37b7aea
186 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 0.9986

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 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
  • 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/wix?keyword=coulomb+law+worksheet PDF link annotation
    • http://tafugegajotu.mygamesonline.org/how_to_change_genie_garage_keypad_code.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/speaking_in_tongues_scriptures.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/dpQhbja/thrift_stores_in_manhattan_kansas.pdfIn PDF document text
    • https://cdn.sqhk.co/dudokirabog/tOzhfgi/rivavebege.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/ncert_accountancy_book_class_12_solutions_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/jalAXig/gidokal.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/dKhpvsf/high_school_crush_first_love_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/jijcqii/53426166442.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/tutorial_camtasia_studio_8_portugues.pdfIn PDF document text
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/nukofadokogak_juvujenaxikef_naxabazuluriba.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/jicCGhd/super_hero_photosuit_maker_dc.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/xofunejafiji.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/wotubu_vilojawegopuwik_bogusagin_fesokasowefi.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/bujutifisibuso.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/rubululi.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/telecharger_livre_pour_apprendre_francais.pdfIn PDF document text
    • https://sanituwinera.weebly.com/uploads/1/3/1/3/131379206/6029178.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/d13c40a9-da70-494f-9987-7f599f225ef6/how_to_use_a_snark_tuner_on_a_violin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a781b6c6-7500-490e-8fc3-2128807ac771/tijobivad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a54f4fa-19a6-4838-b6d1-1db5c188d931/81610395212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2543cc-20b0-41bd-b745-df15041e22f3/us_bank_information_for_wire_transfer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424ec809-7f0f-4b68-bd9f-5535053ec61e/resistance_training_exercises_no_equipment.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 7224 bytes
SHA-256: 0a9cbca757ab9714898c76158d1a6bd07450f80275fa9f4d07ee53f614d181a9
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 4124 bytes
SHA-256: 55f450cb7d68efb1a113ec7728cfa5159071c85a18dde6d3c0602a5a1d7a2866
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 5128 bytes
SHA-256: f6b213935d7506a8d22e6e9227d673754bd12094a5c02dba0413a8e169a84c67
font_03_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10348 bytes
SHA-256: 7f1a125c2dec307c091a6bdd2cc717daf485058ebdc6c86675f63eee8c5bbd23
font_04_sfnt_off000144b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B6 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74