Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f8a1550d04b074…

MALICIOUS

PDF

76.5 KB Created: 2021-06-12 03:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc77c71d53019f4029769957c0a254b6 SHA-1: 19493630a68bd4228765b677cbbc247f93a3748b SHA-256: 36f8a1550d04b074ecce2590574956843cf70658f05f959b631c5a70409b8f6b
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 0.9991

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://oniceh.ru/pbw?utm_term=sewing+technology+book+pdf PDF link annotation
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/dagirajojonu-lozopa-vufewe.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/dbdb2.pdfIn PDF document text
    • https://lodewaga.weebly.com/uploads/1/3/7/5/137518990/b8df96e5604.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/katuwakutasixaz.pdfIn PDF document text
    • https://tebelusagunesaz.weebly.com/uploads/1/3/4/3/134318259/1708104.pdfIn PDF document text
    • https://vubujoxesawuzar.weebly.com/uploads/1/3/4/4/134476738/b429059e07.pdfIn PDF document text
    • https://dosarowit.weebly.com/uploads/1/3/4/3/134315771/20d1c585ca60.pdfIn PDF document text
    • https://xadupokunarufi.weebly.com/uploads/1/3/2/7/132710624/dasijokapevapifavo.pdfIn PDF document text
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/zekewutezub-moxajug-gojewemif-wakajifirid.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/naxosifurimidizu.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/guzojarugavelas_gazaveworaf_nemakemat.pdfIn PDF document text
    • https://pepotojil.weebly.com/uploads/1/3/4/9/134900045/xanorux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://podixarutib.pbworks.com/w/file/fetch/144624033/kerem_ve_asl_hikayesi_ksaca.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144411492/29035849763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec82da69-e443-469d-8182-5a35815dfc43/12234659815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c7c0a1-47d5-4db9-b715-0013bcd54778/zikimesijagodujadulan.pdfIn PDF document text
    • http://gonumutat.pbworks.com/w/file/fetch/144488097/lobosulinuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037ba733-8cd7-40fb-8520-28abf282ae14/what_is_a_grounded_theory_study.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/what_are_base_adjectives.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/f/oxidizing_and_reducing_agents_worksheet_answers.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144643221/short_throw_laser_projector_4k_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174c618c-3323-4dd6-b6ef-ceecc9bb7422/best_road_to_hana_app_2020.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144561948/84534337643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b45810d-a64f-47b3-9f5c-a00e3842f2cf/how_to_delete_vehicle_on_bully_dog_gt_tuner.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_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 5432 bytes
SHA-256: aabfffea03b29f75f6e3761de977e25431191ea8ea92eb7e33b4a17ced09f36a
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 11000 bytes
SHA-256: d61a7431fa2cd8c07cb686a30c48e1c339fad1a96841e31996f926a66dcbcfb1