Malicious PDF — malware analysis report

Static analysis result for SHA-256 8781cfe9ae8115f3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 05:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e06b3e634a2d2ca642b7f1a8d2b78fb7 SHA-1: 2c4701f808bcd18e6c8877bf178ae52abd59ba84 SHA-256: 8781cfe9ae8115f36998263234aceb8b03fe2fb7d46387bc2170ef85170a5e50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to PDF files hosted on various domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ceramkgres.ru/userfiles/file/nepunimufezidi.pdf In PDF document text
    • http://world-green-hope.com/uploads/files/tekonomerok.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/17801206676.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/mozobolavoxanivafetijobu.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/98863923630.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/28728555815.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109070610147150.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/22448593524.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/40581885098.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/79050623150.pdfIn PDF document text
    • http://frchem.cn/upload/files/jizisadiwila.pdfIn PDF document text
    • http://varvshistoriska.com/file/tebogefudevawul.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/zugomawivefizazal.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/6020408567.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/15305027648.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/fenuzofokedopatuxowim.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/lomokimesazizotepeg.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56603919452.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/texufabomo.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/kifosatitefogixitopunot.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/62571234259.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/lisubejozajaxirekovisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+factory+reset+my+phonePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 17280 bytes
SHA-256: 26f31661e234a683e72e813b16f994dd99ca00d155a53ff29b39d72bf6350ce0
font_01_sfnt_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10796 bytes
SHA-256: ffa0ea019706ac89da5498e5bdc6e337b8df4dc1511eee48b6d17fda5e5c240a

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