Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa7785e1e1b6e22…

MALICIOUS

PDF

84.9 KB Created: 2021-03-24 12:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9b596da16109365838c5b6d452a3d84 SHA-1: 5e09fb1a1cf5a339cb7f5e16621b31ab14805207 SHA-256: cfa7785e1e1b6e22ddeed3106a73a516a33b3c3e154deca57523a990209e8854
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 0.9990

Heuristics 5

  • 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 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://zajinet.ru/123?utm_term=bible+quiz+genesis+1-+50+with+answers PDF link annotation
    • http://vulemese.iblogger.org/35922692337.pdfIn PDF document text
    • http://dajexori.mypressonline.com/22672751943.pdfIn PDF document text
    • http://siwutasir.iblogger.org/puvojerovo.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/how_to_use_self_clean_on_ge_range.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/9017f8abc2a375.pdfIn PDF document text
    • https://rofubedojatedo.weebly.com/uploads/1/3/4/5/134586725/45e2a888beb6.pdfIn PDF document text
    • https://nolopatemima.weebly.com/uploads/1/3/4/5/134583633/7857730.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/american_red_cross_lifeguard_test_answers_2020.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/4550487.pdfIn PDF document text
    • http://zelenege.iblogger.org/89305344634.pdfIn PDF document text
    • https://sasepanubur.weebly.com/uploads/1/3/4/6/134600976/4832793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/contract_law_consideration_examples.pdfIn PDF document text
    • http://vutafinaragod.rf.gd/blanche_neige_sorciere_transformation.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/administrao_pblica_augustinho_vicente_paludo.pdfIn PDF document text
    • http://fawofalolujug.epizy.com/63750486773.pdfIn PDF document text
    • http://vetetipusel.rf.gd/23199722358.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/what_are_the_different_types_of_structure_in_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/15373649027.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/88116274657.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/roxevetowunaf.pdfIn PDF document text
    • http://xijotat.rf.gd/obc_caste_list_in_up.pdfIn PDF document text
    • http://buwodusokaxu.epizy.com/99859964885.pdfIn PDF document text
    • http://kufisidus.epizy.com/dixie_chopper_silver_eagle_2760_parts_diagram.pdfIn PDF document text
    • http://wenares.myartsonline.com/tefal_pressure_cooker_repair.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5756 bytes
SHA-256: ae94b223d4e4657f14b3dff08cabcc15f6cb3de3682e3e52a12af8dc13ce7639
font_01_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 11372 bytes
SHA-256: b1776d4a822d9817ba64f4538e798fe3ff0be5931d1132637664a1f2dc3d11bd
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f