Malicious PDF — malware analysis report

Static analysis result for SHA-256 581c67019d70a5fa…

MALICIOUS

PDF

68.0 KB Created: 2021-09-11 08:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f658e74a2c1dd81d3d954d0f6dc8d4ee SHA-1: ac70411e59fb6fcbb662d7b308be5d0be41f1b7e SHA-256: 581c67019d70a5fab222602ddb1dc16acfaee16323ca15be8834dca3273ac272
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm on disposable hosting. The embedded URLs, such as http://rongqichem.com/upload/files/bobaxidon.pdf, are likely intended to redirect users to malicious or unwanted software download sites. The document body, though heavily obfuscated, suggests a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://rongqichem.com/upload/files/bobaxidon.pdf In PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/lajibaziturapitanapag.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/13106566185.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/69747945434.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/gobatonum.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/zesus.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904041455.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/lamotomavunudozipetozaf.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/mobevesez.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/29157123379.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/dapidotafagapelom.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/jowikunepipoxotopanijeder.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pasotaniwetoxolagokes.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87991827792.pdfIn PDF document text
    • http://gro-felix.si/uploads/79709859239.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/52297121756.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/gujelolesexotugudefovuz.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/1820151965.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/gozigofowurasemobenol.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/60550117724.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/somixikopetane.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zuduvifawamosulaxobin.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/nutuzeripewusidaxux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=movie+box+pro+free+download+androidPDF 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_off0000ae0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 14408 bytes
SHA-256: e92e7bb97b37f4651aec0919781d58d50c4401a35af014e2278b4785bee9893b
font_02_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10612 bytes
SHA-256: f57779d77cd48b196824b223b9a8536c069bb29c9b302b47bb4cc72f9b0132aa