Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40b261d09744453…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 05:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4de95d3f236b6584e2f4e709bc48893b SHA-1: 5125ed08e5675a84035961dd10e61c581ed0b9c8 SHA-256: d40b261d097444530ce6cd8a1eec357e4799f6ac67133eff685d519897ccb0a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://gildiamasterov.ru/userfiles/file/mimobisezizevofosulibesip.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630966727_1.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/621002d57c16e24f03234f089b554e9a/39918830139.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zomubodeduv.pdfIn PDF document text
    • http://coffee33.ru/archive/file/39721520410.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/wakixonuwuxoref.pdfIn PDF document text
    • http://12shio5.com/contents/files/jodevenolegepewogigibe.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/69871544104.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/jeraxaxojexobukodewoxixor.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/87570505755.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210912_B4199A793BFCD5BE.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4c489ace---21869475807.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/kozazifezawaxotuva.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/senerulerejapuribomaruf.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/10159119111.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/59151940211.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/66031874235.pdfIn PDF document text
    • http://idcla.net/upload/files/84977046447.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/5533242275.pdfIn PDF document text
    • http://vina2002.com/uploads/files/71458611306.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/finabugirumukat.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/7195821062.pdfIn PDF document text
    • https://ms01bet.com/contents/files/rozobakobajozidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=solitaire+tripeaks+mod+apk+2020PDF 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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 16908 bytes
SHA-256: 5b4ff443464ce0181f767ff1c63c6b669361f9207d196cb70f3ffd8d4dbf4f4d
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 10856 bytes
SHA-256: 6a71509b006dbfb208c5e94f6d3e1b6b8ada85891ff48c46d1760c3b23e6de4d

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