Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ba646d93ba1d86…

MALICIOUS

PDF

71.8 KB Created: 2021-04-02 10:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 04305843cfc23752f2348ab8552cb34d SHA-1: 863bf49b7210229deb72490ce0627aab141eee37 SHA-256: 70ba646d93ba1d86133c5796290094517e8c6e3136dced954ff117ce6567bd06
186 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, suggesting a link farm or SEO poisoning tactic. The primary lure appears to be related to 'trigonometric identities grade 12 pdf', directing users to a URL that likely hosts malicious content or further redirects. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/strik?utm_term=trigonometric+identities+grade+12+pdf PDF link annotation
    • https://cdn.sqhk.co/tugirujozi/igjbZqY/zedesikezatuvugagizisize.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/g7uA2Ge/damage_report_form_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/jdiiRg4/easy_obd_obd2_elm327_easy_car_diagnostic_tools.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/c1c76b38-87a9-4c04-9195-c5dd56f4d5af/what_is_an_opportunity_statement_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325510a3-d8ef-4332-80f3-3187915dd472/how_to_clean_a_whirlpool_glass_stove_top.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_7c4cd9e88e274e189de5eda4ac5581b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/9_letter_grade_words_puzzle.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_acc4a80130c04e4bbc3ae6f16222ed27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aeaf0b8-eba1-48a4-8e6c-35661de1047b/bhagavad_gita_slokas_with_meaning_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/lokinadil.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/raduwulosonivuxinavutaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841516f8-cf56-4f13-9664-eedd0a61aeb1/skyrim_special_edition_mods_load_order_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/pofunulopidixumenax.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_a4417de7c3f6469dbb6b700d98794ad3.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_2a6f6666f2954fc39ad0dc7bde29a59d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/chinta_chita_chita_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d3f6ac-abc1-4277-a929-564cc0a6d21a/kozuvufebej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd53f669-642b-4f14-a48c-0627fbec45d2/carburateur_stihl_fs_76.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3faea8e6-1912-484b-9ee3-2add6dd0b333/weziwetopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7b4d69-31be-497f-813a-5814063f129c/seat_of_the_soul_chapter_10_summary.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_e7a8a920abf04dbd933b0c1adffcb00e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/236a01c7-71af-44bd-b2e9-51b214c39c0b/kingdom_of_the_wicked_book_2_release_date_keri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef60e71a-64b4-4fbf-98a8-08ee1d54931b/62919920643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021abea5-6343-48e1-a6cc-61df3750d625/book_report_worksheet_3rd_grade.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 5576 bytes
SHA-256: 211f8128ed6c7547e5a6c6c83f2685c8bb2b6e40be462ee0f9fccc07486d6cf5
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10580 bytes
SHA-256: f04657ddb3b7d0c6298d4c8fea9c3866a33a2b1be383b59269904f634eaa16f7