Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b73c1672da934b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 02:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dfa9363aa2a7381d8c1e369f7bf49ee SHA-1: b871188b2beb31cc21570bb8d10ccdc359fa1dd5 SHA-256: 50b73c1672da934b8aa822c2c185aee559ec0f8d9f8b260513bab39838f7f688
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The PDF structure and embedded links are consistent with spearphishing attachments used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=ios+weather+app+for+android PDF link annotation
    • http://covina.crazyrockinsushi.com/uploads/files/wugutisunisutetelavav.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/8742541340.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/34211e4290247452efc12813f34a9687/resurulemogagagodisoxa.pdfIn PDF document text
    • http://tdbm.vn/upload/files/firufovepapofepogafugope.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/patimagawalozetu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kofotuxulozotejegexup.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/67265205990.pdfIn PDF document text
    • https://ms02bet.com/contents/files/pivowuxevajoxaniwoxixejo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/gekogozimosixunolitox.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/28936286226.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/62213220396.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/56544557685.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/76833529660.pdfIn PDF document text
    • http://rayanchem.com/d/files/xududigalowejibom.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/96735134734.pdfIn PDF document text
    • http://tecksco.com/upload/files/92550780700.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fibej.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/59175527322.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/bidazuk.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/56724064989.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/80166853989.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/27079924274.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_off0000b24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 10588 bytes
SHA-256: a094fc0965594f4b2413d60194e8d0efcd871d5bcc3ddc39aa8eade0fd6754cd
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 17556 bytes
SHA-256: 93c7b19a130251d9ee71648eed573e8411bf4e40c355b687df796feede830fda
font_02_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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