Malicious PDF — malware analysis report

Static analysis result for SHA-256 8849427e874da104…

MALICIOUS

PDF

78.8 KB Created: 2021-04-27 01:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b6d1aac63050a976bece26666e6599a0 SHA-1: 13c98078c6ba7035715d161b8cac9db8e62455f3 SHA-256: 8849427e874da104be47cc7eb6f52ba2f867b65bcf6bf45c57df93b0dccacf6b
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL `https://baarspo.ru/strik?utm_term=famous+books+on+positive+thinking` is likely the primary lure, directing users to a malicious site. The document body, though partially corrupted, contains text related to books and the wkhtmltopdf application, suggesting a deceptive pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=famous+books+on+positive+thinking PDF link annotation
    • http://maxirem.mygamesonline.org/karumanchi_data_structures_and_algorithms_made_easy.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/autocad_3d_design_tutorial.pdfIn PDF document text
    • https://rezipubifikupix.weebly.com/uploads/1/3/4/5/134511366/fc37503c.pdfIn PDF document text
    • https://keromarire.weebly.com/uploads/1/3/0/8/130873863/zibetulekakanut-kilojom-kujup.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/maria_montessori_timeline.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/1421723.pdfIn PDF document text
    • http://desokore.medianewsonline.com/48847539312.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/bazuredorokuw-tatusazadujom-pitijevalira-lorasedov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_83831b033485480eb8ab9ed43fb6108c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/victory_belongs_to_you_gospel_song.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/acids_and_bases_word_search.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_eae3515bb3f44e81b27a315f59fb33b9.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_8f41763907704aa0a0db3395b28922af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9040a5-2f49-4b24-b4cc-373748204b36/la_catedral_del_mar_barcelona.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/xazelaxiw.pdfIn PDF document text
    • http://pugobafujopelat.epizy.com/larson_algebra_1_book.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/45791969463.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/vakuxoro.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/dozekugediv.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_75493187dfb043d99131a6cc87446c14.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_cfb16a668c74454e90895e474f558313.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/019dafb4-7714-492f-9848-bd22c3cdf15b/pikas.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_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 5324 bytes
SHA-256: 732e33b87f59330b4c3ed6f391bc57ad65d8ef1992c051022cfe17084aaf9f81
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10420 bytes
SHA-256: fec49adfdf3a9950011d9cdb79a2b66b17b8892b881fca5c9ae897e9d121bada

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