Malicious PDF — malware analysis report

Static analysis result for SHA-256 952871d7628fd027…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 05:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e183ab8a0e84b7ea1dfca9754863335e SHA-1: 7f06522b2f3b32a9e586e3dea5e60ba8790c812d SHA-256: 952871d7628fd027e9daefaad8cb91ec86aa34077c5aaa02e06def24bfc454ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download additional payloads. The high number of external links, many pointing to disposable hosting, further supports a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+download+to+sd+card+from+play+store PDF link annotation
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/42510630213.pdfIn PDF document text
    • http://www.bash.cl/media/file/66788785398.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/74545512882.pdfIn PDF document text
    • http://premo.at/userfiles/file/dazoluginisemudojurelive.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce1fcde75---68568860563.pdfIn PDF document text
    • https://limsurdua.com/contents/files/rawuwixitetaludilonusu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/71897366817.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109071759253737.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jesawateveritiraledak.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/pojenem.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/dibuxowobewesejuzusop.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/taxijujoluxoku.pdfIn PDF document text
    • http://wohntraumgmbh.at/tudovarefifatokebujazite.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bd5b333841543f4f5a12cd253dc3ee04/97480428452.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/jijujaminam.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/10621252413.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/50592354500.pdfIn PDF document text
    • https://5uempat.com/contents/files/81230438902.pdfIn PDF document text
    • https://kokomanis.com/contents/files/46225144440.pdfIn PDF document text
    • http://beautydent.hu/editor_up/45568005303.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/52901821290.pdfIn PDF document text
    • https://egca.fr/userfiles/file/sewogijaviwefodurev.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613eafbdd89cd.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 17716 bytes
SHA-256: 76de5f6192bf4f9f082343f2b6d02dd21c0d6d1387c5a4c711aef30575c59e4c
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 10880 bytes
SHA-256: 847e9e6ccfc3b16ba53c4e4fe25ad3e48f75a51524a1d24515bfba128260c013

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