Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05ee8856d4fa29a…

MALICIOUS

PDF

89.3 KB Created: 2021-04-01 23:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a358fd3b2261cd00bd870e1f71d00755 SHA-1: c5e9d88cdb789592cc14f2b612be248fbdb18cb8 SHA-256: c05ee8856d4fa29a232047270f4d5e21f32b7b73fb877b193b7abf4c0bfe145d
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 0.9998

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://dugedepap.ru/aws?utm_term=singer+20u109+industrial+sewing+machine PDF link annotation
    • http://jesibijifinuz.mywebcommunity.org/46335103749.pdfIn PDF document text
    • http://reform-st.ru/33275196410andd1.pdfIn PDF document text
    • http://roskycnmx.com/764443033320uzgb.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/1063101.pdfIn PDF document text
    • http://vemasujananexu.22web.org/baofeng_radio_user_manual.pdfIn PDF document text
    • http://usacreditmonitoring.info/comptia_project_study_guide_free_downloadex5tl.pdfIn PDF document text
    • http://all-system7.club/jump_rope_workout_routine_for_weight_losshjewb.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://ilkertr.shop/refenagug4l0ks.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/is_flavoured_soy_milk_good_for_your_stomachz4jqy.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/how_to_start_a_home_baking_business_in_texas.pdfIn PDF document text
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/zagefogupe_koranekovagutok_wividaxojuma_pezulewed.pdfIn PDF document text
    • https://tagebukolili.weebly.com/uploads/1/3/0/7/130776523/e9be328f2a.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/e62f088e.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/vedodabonunole.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/elementary_symbolic_logic.pdfIn PDF document text
    • http://afracheat4.xyz/what_is_the_average_salary_of_an_acca1ucux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://farefimejige.rf.gd/is_ahsoka_tano_in_episode_9.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/emotional_intelligence_essay.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_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 6032 bytes
SHA-256: 63ef811b83850aeca0634b7d9f7f147c7ee80d4b5235fd7d712705b592d8e46a
font_01_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 11184 bytes
SHA-256: 4a1e315996cfd79b1b0e17e05b9bcde2b8aa4b1fdd9ddfbff106daf86472f552