Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73c214d26fa7fd2…

MALICIOUS

PDF

83.8 KB Created: 2021-03-20 14:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d06dc873ab66c9f6e8e7fb724c48ed52 SHA-1: 0b160b05a1876057153e1fb4deada7ee057a8378 SHA-256: b73c214d26fa7fd2acf6a21047ab848cc685e34dcb7ca58728effd9ed114a03d
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content.

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://kuzutuzo.ru/award?keyword=south+african+road+map+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477155/normal_5fc710c17ce8b.pdfIn PDF document text
    • http://voirlo.xyz/bunomanefafuzilewuxifuroghshnz.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/what_lexile_should_a_3rd_grader_have.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_5fda91005a2da.pdfIn PDF document text
    • http://zefabafiw.22web.org/22583347878.pdfIn PDF document text
    • https://tigepofawi.weebly.com/uploads/1/3/1/0/131071288/fujimukena.pdfIn PDF document text
    • http://astropsychology.website/jaligukapenx3d2.pdfIn PDF document text
    • http://piter.store/kilenixinud07mv.pdfIn PDF document text
    • http://segwaywheelchair.ru/196980090244q00r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6042c522ed944.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/27659962170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6032ef5f0ae47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_6038c4949c536.pdfIn PDF document text
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/1030172.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/cuisinart_dbm-8_user_manual.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/list_of_essential_oils_and_their_benefits.pdfIn PDF document text
    • http://reduslimitalia.site/what_does_rule_101_mean88jlr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_6004723d2ad96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofopeba.rf.gd/sozovibixezudutunuweraf.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/baburnama_battle_of_panipat.pdfIn PDF document text
    • http://gifibulilak.epizy.com/harley_davidson_sportster_883_owners_manual.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_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 5288 bytes
SHA-256: 67180e1378bae4b47cf1aaf342de33f062ef03adc580a9b9399692c460ce3891
font_01_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 11088 bytes
SHA-256: 6dae586a7192b80c13b8dcd778e7b5ac2a1223fa91675c78828e4f2bacb20c5f

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