Malicious PDF — malware analysis report

Static analysis result for SHA-256 c428e26af1a61251…

MALICIOUS

PDF

101.8 KB Created: 2021-03-31 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ff878924ad73a7a9187b78d6ef21f21 SHA-1: 11a5cb60dfc1e6b026ff727a03ebdf030d8c93df SHA-256: c428e26af1a6125140153a13f0f1a4c7bf1e601b5f14671ea147092891cbc7cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9904

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://bologen.ru/strik?utm_term=introduction+to+computer+system+class+11+ppt PDF link annotation
    • https://cdn.sqhk.co/togixulala/9cP9Ogg/simple_algebraic_equations_examples_with_answers.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/important_english_vocabulary.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/jjDtwqW/wefasodewekilo.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/get_ielts_band_9_task_2.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/nazejodazo.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/EXO9rhi/kuropimiwipomiwagig.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/jhwCgjY/free_hair_salon_business_plan_examples.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/gate_engineering_mathematics_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/55abhdf/pokukipeginowelulotu.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/jigedjb/recette_sandwich_aux_oeufs_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/suzivizagula/Pii3je8/47889276823.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/zsa2gdT/worut.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/ggMlhjd/the_pch_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/d8nwjbo/negotiation_skills_course_outline.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/e6360a27-9826-493a-9816-2c1f7d1f99d7/38493276024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7316e20a-0f88-4b30-bf38-bebefe9004a7/lutiwuxetev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd48dbd-fb25-42dc-8864-c1cb881b8a02/xoligororofanarinumiv.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/71086858245.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/46348566818.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/bgp_router_alley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f786b0-5eda-43a7-8544-2df799e5755f/plantronics_bluetooth_headset_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18168af6-fe8e-4905-815d-3a3caabd3a4d/24895228977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206b0e80-fdcf-4c49-b429-c9af54dd2567/2013_infiniti_jx35_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5d90bc-738d-4362-8260-fa33b1e65704/47436318512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b9d18b-b6af-4c0e-83ce-e6c2932356ef/do_jumping_rope_increase_your_vertical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e43c622-06d8-4b5f-b4d2-285fcd52292a/final_cut_pro_x_trial_crack_macos_catalina.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 9996 bytes
SHA-256: e02127549de99f37b7a0a8979fb451e5c06e3277e80c5ed85989c2c9b728a6f6
font_01_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 5312 bytes
SHA-256: 875c83c11be8e91e8c8b6e7064013fd146332f1d03e000e47f7ab3d588a57ede
font_02_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 10716 bytes
SHA-256: ed802c61972841f4a598f103fa68a8c10fd580b5fdaa811ccb32a61d27f456f0
font_03_sfnt_off000171c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C7 16148 bytes
SHA-256: e7e500e9a025808c17d208be9994784ebb1bcc804fe072e89bcb0c8977bc56f5