Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb0a9c79d75809f…

MALICIOUS

PDF

101.6 KB Created: 2021-03-24 21:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ec08499df24dbc88338563fec34b5ed SHA-1: cdca579e9ad500e05aab7f6c80c17d608be57b21 SHA-256: 0fb0a9c79d75809f53dba9326011e61f08e304c23cc5ed845209cb169c954588
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=call+me+by+your+name+free+stream+online PDF link annotation
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/a057bf38.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/vunuwib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_602c7d8a99b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fe5e88e1dc33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_6014918a5ec9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ff607407d357.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/2a6eb81865.pdfIn PDF document text
    • http://lalashoppen.online/1987_toyota_pickup_factory_service_manualkh926.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/016b5244039.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/lotav5cs5p.pdfIn PDF document text
    • http://fastgetme.online/jabixifovizijobakunuui16z.pdfIn PDF document text
    • http://kmplitka.shop/influencing_others_interview_questions_and_answersanhq3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_604f35ec72a6d.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/008882cf-e8f6-48db-8cf9-246e333445e1/87066987563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48bc714-4439-4901-93ea-98f8e49f96e1/veraxanotodugilozodarogi.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/email_template_builder_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/enumerated_powers_of_congress_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/excel_contingency_table_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3e9356-ad0c-4259-885c-e70307513091/the_blue_book_used_car_values.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_e6972fd279c6425995e685e3960b73a5.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_874a8b8fc9054eb1a4d8207e29028411.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/nice_guidelines_depression_phq-_9.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_8938427480144a4181744ce99473f6e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f33b16-bc0a-4d44-9b38-13f0d3fab057/nosufuwojejisazepovonev.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/tabla_periodica_de_los_elementos.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_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 5060 bytes
SHA-256: 6fc554e30bc8265940aaccf92dbe3e36d24b64c27365a85317927448f92dbd92
font_01_sfnt_off0001512e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512E 11532 bytes
SHA-256: b1ec43d49877a491a3b06c4af0c6436be5ee103812018d53e9ef7442e948a4cb
font_02_sfnt_off000178a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f