Malicious PDF — malware analysis report

Static analysis result for SHA-256 388a2fcb5cbc03ee…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 09:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4018bf3cc413163e2fbc42b23bd48f7b SHA-1: 1b87f7a313a7eab49f03e5102bc16fc6277dda07 SHA-256: 388a2fcb5cbc03ee4877674e6b34e4d1c472009147d5d1c8c17494047f7ed040
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a pattern indicative of a link farm used for phishing or scam operations. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pretext. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=imaginefx+pdf+collection PDF link annotation
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/49727036412.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zaruluduzagadusewete.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rji80kpcg80l0sj8s4fpt4vir1/lubebiwololamek.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/3002240684.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vokatujijixibujowi.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/82988526493.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/31742826972.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/zibapatubagojobe.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/83582677214.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/9292898252.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/86770263615.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/tulisa.pdfIn PDF document text
    • http://hydrem.ru/images/file/xemajole.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/kewizepoputijaku.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/56309314424.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/3778896261.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbd347108f---losib.pdfIn PDF document text
    • https://armenia4d.com/contents/files/fojokipak.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/bililomakewukipozo.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/limori.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0921/267579914aa03002177941dbe00b94c8.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ludozolebapono.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://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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 10748 bytes
SHA-256: d5651bcee0cf19b1efcedd42e09ba023cb6c4a2b2f5873bb7930ccb1396a40d3
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 18252 bytes
SHA-256: a2a7282e595ff2422acc39a0ea0fd81c31233bdc642d9e0f75dc85e9b06511db