Malicious PDF — malware analysis report

Static analysis result for SHA-256 924c707097496227…

MALICIOUS

PDF

76.6 KB Created: 2021-04-11 01:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 337e4e134105193cbee0f37283791ab3 SHA-1: 6654fa991c3cc4a6eba7188da4dd3fe0fdd4d14c SHA-256: 924c707097496227e254bb5c6f412bddeb372de7d59896857b51a4ee41cf6ebd
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=godfather+death+pdf PDF link annotation
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/881d7da6f474d.pdfIn PDF document text
    • http://novawepe.iblogger.org/electrical_symbol_for_tv_outlet.pdfIn PDF document text
    • https://nexiwurepefisov.weebly.com/uploads/1/3/4/3/134372078/9556625.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/wefadowigomowe-retepular-beguwumadubajo.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/fepajumasana-valenominavana-renanetil-zupemiburesaxop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_4ac5fd9876144879ba70278e93ae90c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b982afd0-0300-4663-9fd1-4b8f4fec309e/how_much_does_a_steel_beam_cost_per_foot.pdfIn PDF document text
    • http://vatoduk.rf.gd/big_data_analysis_platforms_and_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bdf986-0ba5-4d35-87c2-9118fc9a2512/hp_color_laserjet_cp4025_ink.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_e6e10847d6d5412cab578e79f7d4d888.pdf?index=trueIn PDF document text
    • http://pepukogabam.rf.gd/microsoft_project_cost_estimate_template.pdfIn PDF document text
    • http://fukorow.epizy.com/18162319227.pdfIn PDF document text
    • http://lebekuwawelu.epizy.com/supply_chain_management_bahasa_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb917a44-9074-430d-aaf6-02b62757f97f/dexavanepujizijemegijevag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d0830e-6a72-41df-9751-581f3d28c1a1/81058104630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246e2e55-3f0c-452c-82e5-d4f40bd13a2f/echo_srm-225_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690fcdfc-c1c2-4bdf-adb3-9d2421f57886/zikuzinekuxixixaderimejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2906a3dd-b19d-4d0f-ab9d-0e3c8d88d304/john_deere_750_tractor_service_manual.pdfIn PDF document text
    • http://tewenusewokux.rf.gd/57129054752.pdfIn PDF document text
    • http://zuniguvip.epizy.com/how_to_delete_android_cache.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df079068-5457-450a-9bb3-6db2beb98ede/dufokizeraxewudasineza.pdfIn PDF document text
    • http://vijanemafe.rf.gd/2365737037.pdfIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_ace78aa8ab7f4154844a39c48ad2e24c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/277c7cb9-3565-42f6-90c8-24ec75d97065/seidels_guide_to_physical_examination_chapter_1.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 4952 bytes
SHA-256: 4080a66e8d766c65fc9f3d87254508fcf50a430df4c0eb49364fee8558f7b68f
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 10664 bytes
SHA-256: 3d5d8926b2ef08f1a5a03e08606d63789ae517ea80e15f15a3d06b6bdecf713c