Malicious PDF — malware analysis report

Static analysis result for SHA-256 695f1b90e2e42e61…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 07:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 177e5440aab9cfa58ab68a92ba2c6bca SHA-1: c99a6541e1a0fed87c3a29827bc6a2c29082d7e6 SHA-256: 695f1b90e2e42e61082488cf7a7153f1fbe2300c9c685610d856e7874445de84
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple unknown reputation URLs suggests these are likely used for hosting malicious content or redirecting victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ahjygjg.com/upload_fck/file/2021-9-14/20210914114647166597.pdf In PDF document text
    • https://curtain.jinware.com/upload/files/vesuwuburewazodatoba.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80412941698.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/nizum.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jarazikekifugudotapufu.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/69613402812.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/16650940962.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c30efa596b---jelutugikugirokozovoza.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/8451906017.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nolovibezet.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/17633597409.pdfIn PDF document text
    • http://juentai.com/userfiles/files/nodasirepapitimuvawe.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/96683614413.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/gerakoduzeve.pdfIn PDF document text
    • http://nprofit.hk/userfiles/71830649762.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/48583214648.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/69583985093.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/11826777836.pdfIn PDF document text
    • http://etkenkalip.com/files/falagunazani.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/birujatumada.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/63460738539.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/kajogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=which+is+the+fastest+android+phone+in+the+worldPDF 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_off0000afe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 14232 bytes
SHA-256: 93d34005069a1617ff7986ba942418d71958e5e0c2cd9f89f889d44993a4ed16
font_02_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10796 bytes
SHA-256: 1773cf8ad5039134254aa8c49cada19d08b769bf222a8ee9d361221fb92d599d

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