Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78de5efa3191da1…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 02:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: daae66337cb7464884a1380ac8dd4f84 SHA-1: 5211df4d70cab267c18f2fdad22bd1b63f06cb25 SHA-256: f78de5efa3191da13cbe82f053d74feced7293d041941c22d4864432de3f3a52
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 0.9998

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://jottigo.ru/wix?keyword=lee+high+school+fairfax+county+va PDF link annotation
    • http://tells.fun/anthill_farms_sonoma_coast_syrah_20172gb3y.pdfIn PDF document text
    • http://hookup753.fun/pakistan_bhutto_songsjm8g.pdfIn PDF document text
    • http://fb-ig-violation.com/experiment_on_effect_of_temperature_on_salivary_amylasee1pfy.pdfIn PDF document text
    • http://salea.site/79798877698ektfn.pdfIn PDF document text
    • http://salearea.pro/ecological_study_designn3vwn.pdfIn PDF document text
    • http://supermagazforsale1.xyz/38935155705xvkai.pdfIn PDF document text
    • http://itravelimpressions.com/zuvulexotpj54k.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/fDtxhgZ/rat_on_a_jet_ski.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/32192293259.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/dhio27n/hdfc_mutual_fund_sip_otm_form.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/KN9E5je/kick_king_mod_apk.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/toxagexozutedobegijeru.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/mipozekavixolisawe.pdfIn PDF document text
    • http://uanews.website/273012630941rwki.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/wibadinavosunom/pasonigawunominu.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/cerberus_apk_by_cicero.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/vcredist_x64_2017_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/14508058726.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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5312 bytes
SHA-256: a86890467f660f4c805f794ec2bdff5a5212b54d116aa84ce17e7a1c3db84811
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 11352 bytes
SHA-256: 45bb5a7759dcf88a6df9c0f71d11876fcb5b820968391277d6f2293b7524cb86

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