Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b789aa4bd355184…

MALICIOUS

PDF

74.6 KB Created: 2021-06-03 03:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 98c4d8914c36871250419d82b338304b SHA-1: 331c5d24d1f03bb17cbacfe278664d314a1254cf SHA-256: 8b789aa4bd355184a76853ca8d04310ce1c65f904a0d635ecd847fd7057b15b4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://pistant.ru/pbw?utm_term=yaad+piya+ki+aane+lagi+mp3+song+download+320kbps PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5ff68453cfeef.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/xofap_jiwawudi.pdfIn PDF document text
    • https://nuvapagizete.weebly.com/uploads/1/3/4/7/134748671/diwuxo.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/zaresurix-pigotowo-dirilefazasada-batam.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/9e65f8cb.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/ea1e5fd9d97fab1.pdfIn PDF document text
    • https://besukefovubon.weebly.com/uploads/1/3/3/9/133997228/f9f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_601e6949f182e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_602a025e7e04f.pdfIn PDF document text
    • https://timokejega.weebly.com/uploads/1/3/4/4/134454798/mezom_ramexosewuteg_vijojukirekor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2653a8cb-a130-4725-a9b9-c12df67de910/how_to_top_up_a_vaillant_boiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53dcaa8-ccd1-4351-a4ce-7e7a40834098/52830652614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baf49d6-14f9-4181-8646-f8d8bbe9a248/1800_kcal_diet_plan_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64df377-b063-43b5-ac50-c9fe71a0b133/john_deere_445_60_inch_mower_deck_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331b6036-d069-499d-a8d3-9e3c11d7887e/mini_speaker_bluetooth_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0de9c7-70aa-40fc-947d-9c5b38e6b5a1/federal_holidays_2021_opm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d100354e-1f82-4cf1-90c2-309c080ef051/goguzenowizimibotokagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a252727-dae9-442e-930a-ff89a19be63a/ejercicios_de_raices_cuadradas_exactas_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891872f8-8efc-4616-83d4-eebb88952eb2/30904061554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bdb827-6b5d-4561-9da6-6bbeeda6d125/44090326625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed3d31c-855d-4049-81fb-4d78739357b9/federal_rules_of_civil_procedure_48.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3679b69-8a5b-46ab-b829-723189fc21fe/69323575321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 5688 bytes
SHA-256: aa0bf15dc7d5a52ee9581736908eafef468282898b49b956bfd4cd7c55152b53
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10356 bytes
SHA-256: f4f4d5f0283072232705e5aff532b6607ead112e3b74c0e63910bafd0fd845be
font_02_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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