Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfab28750728b13f…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 13:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4ed29076fae37e47ae3e7d7a0da8dc12 SHA-1: 9739e18ff3e42e37942d09a6b68f23f22cbaffba SHA-256: cfab28750728b13fe5b9adabc99fe671e2baeecc415ca5b35eb0097f02f73aa1
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The primary URL, 'https://baarspo.ru/wix?keyword=principles+of+ecology+chapter+2+section+1+answer+key', suggests a lure related to academic content, aiming to trick users into clicking through to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://baarspo.ru/wix?keyword=principles+of+ecology+chapter+2+section+1+answer+key PDF link annotation
    • https://cdn.sqhk.co/jotenitix/UqieFhi/44600696205.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/lQFGmDx/41481917676.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/william_shakespeare_sonnet_42_analysis.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/24543563737.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/igqUjea/rafetanowafamawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418383/normal_602b074ce7853.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/alkaline_diet_plan_for_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fee8bbf78aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fdf2c61422e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6015cdd5a2f75.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/tevinapugotasamolafalu.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hcifiju/lewokivixejupekatubamebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5feb7ba2e0046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fd8341853a87.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/vicr6gg/abbott_laboratories_annual_report_2000.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/make_your_home_among_strangers_discussion_questions.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/c52c2213-f243-4a75-afb3-d49ad81ba618/bronica_etrsi_body.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/best_medical_school_personal_statement_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be72c89-adc4-41b4-8bb6-aa07ba98f6e4/dell_optiplex_780_graphics_drivers_windows_8_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954cdd5d-0993-4b9a-9e57-93b42e9ef46b/74306566762.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/davomubixunobusudekedid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfba3b4-4b73-453c-bb45-99eda3284839/jojab.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 2012 bytes
SHA-256: 90a9be9b3edf7e2763ae955e182ef86f0f874c13b83d1feb44eb98eadad1ddc6
font_01_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5720 bytes
SHA-256: b565e66e371282484b8bb8b9d2c108f0a137d687e1b2e62216509745bfc19256
font_02_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10652 bytes
SHA-256: 87221cdfcd300b688f7d1def7884675cadb7373e4995bec3703d02f9d3a27fd8