Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe16ce2ecf1db37…

MALICIOUS

PDF

106.8 KB Created: 2021-01-24 11:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b1a6acbe79298f748dbcb82c6a1ab15c SHA-1: 9d9ed78df55040af5c888f2d19d20d9fbbe72c86 SHA-256: cfe16ce2ecf1db37a38d6db1389482f1b5a2565ec7ce411b44fce9c29120e023
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, with many pointing to disposable hosting or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs suggests an attempt to redirect the user to malicious content.

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://trafficel.ru/aws?utm_term=drugs+acting+on+gastrointestinal+tract+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5ffbc463653ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_600cb61148311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_6003c4834598d.pdfIn PDF document text
    • http://widevuvi.22web.org/peak_performance_vinterjacka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatonerux.epizy.com/the_abyssinians_satta_massagana_album.pdfIn PDF document text
    • http://sulumasofip.epizy.com/juvipakanujafafat.pdfIn PDF document text
    • http://mefowoweman.epizy.com/78591163741.pdfIn PDF document text
    • http://zexukojol.rf.gd/android_apps_creator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/tojopuvubaneg.pdfIn PDF document text
    • http://fumojaw.epizy.com/42525741126.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/86481866042.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/dividing_decimals_by_decimals_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/complementary_feeding_guidelines_sri_lanka.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/activer_cookies_sur_android.pdfIn PDF document text
    • http://mafofeguf.epizy.com/wugurosusexojeruz.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/bhairava_movie_songs_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/93702131386.pdfIn PDF document text
    • http://lipewolitaden.epizy.com/cad_block_free_lamp.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/massolution_crowdfunding_industry_report_2017.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_off0001648c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648C 5320 bytes
SHA-256: 6902f36d0d9830c570b2a8c582bff907562266e5f31b7b7e9be8403bbaf25031
font_01_sfnt_off000176be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BE 11316 bytes
SHA-256: bf1052593a7e9f7781868d3aae7eca10e9108ef934293c8fe474f45dba13ced9

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