Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12dd122401aab21…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 01:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a27740bc3319d4d5a4209adea5e4ce34 SHA-1: deab15510fd7fc834ff7c381915a8d3ba800e783 SHA-256: b12dd122401aab21ea77c6f4e39640dd2fd5c5821b5b5807179bfa71961d95f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a phishing or malware distribution attempt, likely delivered via spearphishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=la+consolation+movie+online PDF link annotation
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/tunowefapuwoxenekad.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/71813168757.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/gumudiritisuriwukerusiwa.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/75700489431.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29604901135.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/4629758468.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/kolupin.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/44981224541.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/75327285440.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/4413860134.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/82500592092.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/gesukekopuxixe.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/59657508393.pdfIn PDF document text
    • https://mavibusiness.it/file/98891897895.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091912440713.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/tuzegutexevazo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lutabivukazi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/soxodalixemezarope.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/wipamikisodimenujigoko.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/66314245145.pdfIn PDF document text
    • https://digireg.it/upload/13741866181.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae6264afda8317226602e17d4532c68a/62750082400.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_092842_150.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/35220780799.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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 15500 bytes
SHA-256: 152b0a7811bcdcaed9d9c696d8e4c6387402b3b936b817c48b8eec4eceef4084
font_02_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 10316 bytes
SHA-256: 44aece6b497328e9e49702ae3e83763c1aef954f64259f9bc69e1f54173ed25c

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