Malicious PDF — malware analysis report

Static analysis result for SHA-256 db65d6a329cfab31…

MALICIOUS

PDF

66.3 KB Created: 2021-02-24 10:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 38b812c71bf26ef73b92ba26fe7d7eac SHA-1: 9c83004c6ad7fed85bcce786e7e4317487e1af83 SHA-256: db65d6a329cfab318c6314550c7e1e09b2e29b91cc281497a489021c02b9311c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs and the overall structure suggest this PDF is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=what+to+do+to+become+a+medical+assistant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379960/normal_602763e2cdb2f.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/icIgjjh/gotaregusiv.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/idhd0jg/watuniw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_60027c8b07e7a.pdfIn PDF document text
    • http://igcopyrightverify.com/2116475102ksyq8.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/2701983.pdfIn PDF document text
    • http://ooovseanalizi.ru/10595853758ez7kd.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/giduzarinumeba-bilagoref-fomejolowovudus.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/dCXiaii/65315985666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5fdb64f68e0c9.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/e4ifaig/vemobetuzorikeke.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/789058.pdfIn PDF document text
    • http://tibetterrier.ru/700456586565djqx.pdfIn PDF document text
    • http://boevoenlp.com/different_types_of_crochet_stitches_ukxa3x4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5fcb39ab266f8.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/jahegjg/57874273237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/asthma_ppt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/counter_strike_pc_offline_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/napizepedimipepotomesas.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/bal_hanuman_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/blackberry_q10_os_10._3._2_free.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_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 5236 bytes
SHA-256: 21d39f6fc5c16a05999c7d72f73ead98775a7a6fe9aba420fe80d5697c3d8e20
font_01_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 9236 bytes
SHA-256: 5077af9830e09f20956e98bba56c1dc124fac9f66e0a067d9dacdb4bb972169c

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