Malicious PDF — malware analysis report

Static analysis result for SHA-256 74216abdfc10a4c8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-18 19:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54127db87eb67d3a91a214edb5c6a0ea SHA-1: 5a111fe7a54f13f8572f82bb3d0e5d27066a1576 SHA-256: 74216abdfc10a4c82c7d116fc72e8d46898c244ad3b06be370aeda526035ff10
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 0.9993

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://resalured.ru/strik?utm_term=my+pet+dog+essay+for+class+10 PDF link annotation
    • https://zudabipepapob.weebly.com/uploads/1/3/4/6/134672750/7365809.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/lazup.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/oJ9gjic/wawebevumegok.pdfIn PDF document text
    • http://jajitefufig.iblogger.org/30281737336.pdfIn PDF document text
    • https://cdn.sqhk.co/zaletimerizo/gevhdRy/68761744959.pdfIn PDF document text
    • https://bipixivosebik.weebly.com/uploads/1/3/4/5/134516267/3094b39205.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekasip/ggichh7/analisis_foda_concepto_segun_autores.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/2FzADid/jozipalidosejofijezunu.pdfIn PDF document text
    • http://rolevuses.iblogger.org/ccna_cyber_ops_lab_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_80972197441940cc8153ecf1fc9ff7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3605c547-4175-4312-9371-cb574376f857/43640399175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90958bc-2729-4dcd-8def-4726ede1efd7/89812708498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85e2770-c14b-43dc-93fe-6a724e89ddf6/meaning_of_global_marketing_in_business_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3053d2f6-996f-46a9-87d0-3048a42ace27/best_fenix_headlamp.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_1c8eaaff029442e8802b45e624d7fdee.pdf?index=trueIn PDF document text
    • http://kobuxotaregudes.rf.gd/lezojamivabopevonisedan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a471fd4-8ae4-4e37-9fa4-0d7980a782a6/wosetugudopivip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30291179-e302-4233-82a9-d7664e5ff643/que_es_un_sistema_del_cuerpo_humano_para_nios.pdfIn PDF document text
    • http://ludilisi.epizy.com/12706678372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4695fac8-1614-4a05-81f9-22da25c56a48/69420868313.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_9fcf40793f344bd2ae0f97151f6b208b.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_22732a8ebaab4de98e2ec44e28b57d16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acadc07f-d5a2-402d-af8d-ed469f2a36b9/jokizumerofod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9bcbb5-7481-4c25-b8a6-7ef43a8218f1/lewefogejumuwojar.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_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 5624 bytes
SHA-256: d1c4a60fcf9c4aa64a9d3a3be7efecd978bb9fd0e0719621a41f4c24611a1d61
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 10744 bytes
SHA-256: a8346f9070681e401ee35a0d2fead5a5b7c74b4b8ed58894b933594ade7ce984