Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f1c53d16182832…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 20:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0146465a1bafc263dfe28d4cb43c8419 SHA-1: c0c77ac5275af9944f559f02e59e1c5918cde838 SHA-256: 99f1c53d16182832437d02a9c5dfb90f9becf35cc462aa6e77b4ca388e6f8825
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The primary external URI points to a URL with a query parameter suggesting a lure related to 'zaltv iptv player apk', indicating a potential phishing or malware download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=zaltv+iptv+player+apk PDF link annotation
    • http://makinsushi.com/uploads/files/46433461784.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/duzixupabuvadutatavazekod.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/muminexifalili.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/ditaveluw.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/losujibipisexi.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/sugubil.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/xametomeretobusimatuvuviw.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/wesaxunoturaziluwunedujo.pdfIn PDF document text
    • https://bak.vn/upload/files/63968499308.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/29237359042.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/lofitibefazogowiduloraru.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/73336941534.pdfIn PDF document text
    • http://pneusmarene.it/images/file/legakixutosalexawofen.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/pasifixaru.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210924223628_a2VrYXhpd3U=.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/40601494648.pdfIn PDF document text
    • http://meditopthailand.com/file/87686885878.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc9fc7acf---fimadovofijabit.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1632089197tuwafefodugejivipise.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/pajowuvabusigosigi.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/dozikilozefugobofurebi.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/pikiraxadizawi.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 10088 bytes
SHA-256: 933ba181ffb4063233f02e89690467b4eb8b804cfc2fb063c25f6ccbe6f5f07b
font_02_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 15036 bytes
SHA-256: 6b20f82296eee537e55b3038a388261705a916d6054980e3004a9007c34faf8e

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