Malicious PDF — malware analysis report

Static analysis result for SHA-256 289aeccc1fd62926…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 19:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec9fb2e9252735ee9588d35ac0414bea SHA-1: 11c23c549b33a4392b98365d9f12a8fef8ff7489 SHA-256: 289aeccc1fd62926090d6457450038d516374085ff46469797e46254a733ae71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://zaun-produzent.de/userfiles/file/96883245818.pdf In PDF document text
    • http://egyptlance.com/userfiles/file/romivafomajo.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/41747714249.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/3170969672.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/foredoxumav.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/rapizaxuzujogegepu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/zunidujulitakus.pdfIn PDF document text
    • http://ducnhua.com/upload/files/78173291596.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/lutubilaxewanisos.pdfIn PDF document text
    • http://parfumland.sk/upl/37985847210.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/18244827728.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tovaxes.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56230292494.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/61615416510.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/80063806555.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/67860908884.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109121810067172.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/tipubodobadoxoduletajuv.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/51708749498.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/lafifekuxetubugo.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/95427056480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+crystal+free+downloadPDF 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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 17632 bytes
SHA-256: 17ba4c0f8eda96ae855ff26473c992b2a5b9f2dda3ca75b2b302d5bf847423da
font_02_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 10840 bytes
SHA-256: 41508b408f1b432f5adeb8f5c10336392a320a0276353c8d633f0e030a4649be

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