Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd540842f18b3e7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 09:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f90d9c70389731b90f5f1cf735d67cc7 SHA-1: 8959a17e3236d44cf9075224bb7e257be63ec64b SHA-256: bfd540842f18b3e7b35aca67219eac11ba556e4188e49503482636fc908739c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9951

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 http://sapientgenerator.ru/files/userfiles/files/56405993382.pdf In PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/59381220200.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/mematosaxa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348418db5e4---fukuronakujenatokabo.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/61782861867.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/87074891295.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/16838904132.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/buvikosezokele.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/42798445743.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5a91386ff4e463c6a70051cc2d6305e6/toparapofabanunizinuni.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/tepuwoxibiro.pdfIn PDF document text
    • http://actinq.nl/upload/file/memadavugutoda.pdfIn PDF document text
    • https://atiksigorta.com/files/62632000052.pdfIn PDF document text
    • http://synhbio.com/upload/files/72193265955.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kokuvel.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021942242578102.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/31525422309.pdfIn PDF document text
    • https://efnnma.org/files/file/42546098653.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/busim.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/warubemavigesojokujitadip.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/42618022884.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/zanunimapiwudirikazedezum.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/24072244017.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/tizisegubobaroxukutuziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+10+pro+vs+10sPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 10428 bytes
SHA-256: a28d289d6b935f4d000f770ea76c7f47280fa8c9b65b1cced0bca0585b49b7b0
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 20580 bytes
SHA-256: 608fa32e1c7842abcc40204fe21d153aeb5d511977378469aa027fc578a1f866
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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