Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedb5e0ce3113ef0…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 18:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6779214ac3e3c4084e089d98ac482365 SHA-1: e7f1f411dd2075671d661b5571dc18d8a085b2e1 SHA-256: cedb5e0ce3113ef02a19e2624c33492a9033fca2391d8b4a0dddee3e222735fe
186 Risk Score

Malware Insights

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

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 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://dafemum.ru/wix?keyword=6th+grade+science+standards+nc PDF link annotation
    • https://cdn.sqhk.co/lagolipumepi/AZE8jcS/barawupised.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/how_many_types_of_exchange_rates_are_there.pdfIn PDF document text
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/tokagasawi_piwopir_penosusotak_kunavikogesi.pdfIn PDF document text
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/fde8fd.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/h8iigcY/cbx_cross_border_xpress_transportation_and_shuttles.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/oiaMjf2/dcc_train_control_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/QhcIghf/slot_games_you_can_win_real_money.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/pojogexivorusemumuzaxudej.pdfIn PDF document text
    • https://naforuzutexas.weebly.com/uploads/1/3/1/4/131438024/pezesasirixodulela.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jeajfQe/ceph_io_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/jDZ6gi3/felekukoroz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/fabuduwabuzokefokokanarag.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d6fba8df493c47eaaf9a53ba6cda5010.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_597296ade42b42ecbf08d418c467a56b.pdf?index=trueIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_4659a3d485234e1097675decceca4471.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_00b22cabb5b94d8ebf80589e7e39c76e.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_053c63d2e47b4c8592bc5d19c1c6b560.pdf?index=trueIn 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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 5228 bytes
SHA-256: 06e45046ae0c9827c5d54f39805508859d81725b264a142b02e145b04477bad5
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10856 bytes
SHA-256: d5b344c17bcabbd15e7086d70e746cb9cf428505bf83d5860d331ac5201b5c1c

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