Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f59fab9c340453…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 19:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b7bf2bbefc67615b92badd3eab8d584 SHA-1: 5d8a437e1db459d121beaf79cf304017061609fe SHA-256: a7f59fab9c3404537a09cd43dda85944296b8be41f04af8188a83c04d13a689f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://elcolono.net/userfiles/files/87184535365.pdf In PDF document text
    • http://dyglas.com/userData/board/file/jijixobabivibulupaximur.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/96256934574.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/zatolopapajepemigalukor.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/10871627823.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/vujikuremi.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/mulunozedemopewiwenamaf.pdfIn PDF document text
    • https://claudiodituri.it/uploads/80504995787.pdfIn PDF document text
    • https://jin-ji.com/upload/files/93000610032.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/87660555440.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/73310308093.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/burunidolifabanizuvu.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/naponanuk.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/94660440415.pdfIn PDF document text
    • http://iviltra.lt/images/files/pamuxujisipifovepumigew.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf11d63c4---91539115570.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/zofugulilovosexikosowuk.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/kivigetakogivonizazorufa.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/jifokasedew.pdfIn PDF document text
    • http://iltorg.ru/upload/file/57995160229.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/xapupogupigagovuwivuv.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b31d358cb---xafiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=la+crime+stories+4+mod+apk+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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 18020 bytes
SHA-256: 76c79a9288c01db957b76da77d12b72f8ab5a4ac638bf2684d7bdd1af9768add
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 10888 bytes
SHA-256: 01ffa90a4987646ad25bf5d3ec60c9af1eec2506c1cbf9a25fb24c33c5bf8b3b
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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