Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2af01bc170c63b…

MALICIOUS

PDF

93.7 KB Created: 2021-09-12 13:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 360cca3e5659bf003a37c948fbb215bb SHA-1: 0ddcfff3e084d845ff3d046eb382338405bb9efd SHA-256: 5d2af01bc170c63bbab1b776a881a3bb38e9f47d9f61f19a983a42584cb5bce1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://yp05.com/_UploadFile/Images/file/40340002221.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dp8ro76v0ka9daaufqud0b55v2/saxumofenigemadur.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/46049674376.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/bixogiruzanixe.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/vabegepidujakusime.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/wokiv.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/juxulanefijorosefe.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/9801605234.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909165947.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/pegoxinisarelotatus.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/60471797382.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/61433572163.pdfIn PDF document text
    • https://apra.pl/files/file/bujekakefatagoku.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/fisagakagilakujusan.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/kosuvudenubobisokizav.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/42902136265.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/52693248055.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/55486949033.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f1e2f6a45791432909bd5d5a6339fc24/38298729904.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/75425663871.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/suponaripeseforonofavupom.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/muris.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904095905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+daily+instagram+likesPDF 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_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10656 bytes
SHA-256: 420ea66b44b94c5d5c43d22bc68864600d7e1bd995f9a7cf3ddf73550edf7ea3
font_01_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 19256 bytes
SHA-256: a09d144f817df7222744da6fae0b210837ce8d6893466f466392e14aa4e29511
font_02_sfnt_off000150b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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