Malicious PDF — malware analysis report

Static analysis result for SHA-256 244912e9f1eaaceb…

MALICIOUS

PDF

77.4 KB Created: 2021-04-06 19:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8fb3e7aeee728358d0b3c433d686f016 SHA-1: 57fa8a490b8b0ca2b5789553da7fe179de0fe387 SHA-256: 244912e9f1eaaceb2bea4b8dc8ab9754af30615e6ee7c3b8ecdf85e83647bce5
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 0.9997

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=how+to+use+hamilton+beach+rice+cooker+steamer PDF link annotation
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/rezozazimisoten_vadamin_purok_dugisefakeju.pdfIn PDF document text
    • https://miwozomeme.weebly.com/uploads/1/3/0/7/130775979/danibodaj.pdfIn PDF document text
    • http://useraisins.pro/xavomajituvixamamafav0a3v.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/d54d52584b055ba.pdfIn PDF document text
    • https://bubawupuga.weebly.com/uploads/1/3/4/3/134380130/vemezit_zudanoru_rabix.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/anemia_ferropenica_tratamiento_farmacologico.pdfIn PDF document text
    • http://indir-kazan.com/183172144518w3r0.pdfIn PDF document text
    • https://pimoraruwozego.weebly.com/uploads/1/3/2/7/132712303/vodapipefuwixaga.pdfIn PDF document text
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/daloxopi.pdfIn PDF document text
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/jelonebex_fojin_bibakuketozad_wunigav.pdfIn PDF document text
    • http://tisejamebip.sportsontheweb.net/80214997967.pdfIn PDF document text
    • http://ostanni.fun/11313438123jrpyk.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/748d264.pdfIn PDF document text
    • http://beamorem.com/nudidojoximekizevokifafox0nnif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_3fba5093a79a4b08b95337a771ab581f.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_0566823a06934feb9192e215cbbe48c7.pdf?index=trueIn PDF document text
    • http://vawolanuxoreg.epizy.com/banting_diet_green_list_recipes.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_7499581396f54c888033936698159f32.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_f31bc109c33d4398880998a91e2efe05.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_437f5d457dc94a4497cf6e021c74c85d.pdf?index=trueIn PDF document text
    • http://vugoban.epizy.com/blood_circulatory_system_of_human_body.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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 5296 bytes
SHA-256: 0d9012fe53ec3bde2c0194b0975be8eb7bba7bae8496af58691f4c5d52b7d538
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11016 bytes
SHA-256: 119b155168d17280e93a914ece1a1bbb661909fcbe1111c32158a348182ecb5a

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