Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28e42351402e066…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 20:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e42d2aa67f673c71c543c288e3cecdae SHA-1: a08d160a728238705671f5c377ff25e931267c2f SHA-256: a28e42351402e066ec9145437d56b31dc4e29e5c0c8bda051fb32b07a4b4aeb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://wellnesszeewolde.nl/site/data/ws/files/dusekud.pdf In PDF document text
    • http://fleshlight-tw.com/userfiles/file/19689148132.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/pukeduvivowedigiw.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vefuxetezofarelojitup.pdfIn PDF document text
    • http://rayanchem.com/d/files/32076338187.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/xesiwokipobiremujuro.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/ritemejujizilasose.pdfIn PDF document text
    • http://huiking.cn/uploads/file/07163727916.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/taroredixijijuzewetesipev.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/46217936538.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/furase.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/ladif.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/86758640525.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3c6b434ac1458cd3158c5c20abf49fcd/gaxowufizekenokofafet.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/notizexesazuborurukusi.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/70505508052.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/84958427525.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/83216584040.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/90816962442.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/lekiwumavoxuz.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/xukidosuri.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///kamamuremevorutus.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xevanakezefonomaxiwu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/xakoridomovuliv.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/69470479259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prince+ali+quest+osrsPDF 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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 20044 bytes
SHA-256: af4d966cd66b8f516f8cfc134234a8cc0807c467ae6ddf1479f4ab08f1324b01
font_01_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 10468 bytes
SHA-256: 248baad003232e157d4eb51a104ba88e0b5d46e202f2ecc7c67096bcfac4479e