Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f96103a13f7abd2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 17:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a4315ff37bbd34eefd27027caaaf9591 SHA-1: bfe72ea9e050dd6267a0a6e60c19a4f5355c0589 SHA-256: 2f96103a13f7abd2e4d2db259f03ab8ebe5e42252d96c8541725f618a0e0c2f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting, indicating a link farm designed to host malicious files. The presence of a 'download button' heuristic and the ML classifier flagging it as malicious further support this. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan payload. The document body is heavily obfuscated, preventing a direct analysis of its content, but the overall structure and heuristics point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://csc0731.com/userfiles/file/20210902225848_cywhmk.pdf In PDF document text
    • http://e-menu.hu/editor_up/23866138966.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/sisasenunafezerojijexem.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/82351894754.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/setutisalosuwuburesomeso.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/biterivazejot.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wejewavokapedisenevozixo.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/dofumevopitasejalab.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/juzefaxiromovonabinoli.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210905094708796.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/gadodowolesuxikewe.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/20583589533.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/levilofigeguribepi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nagejuvirulevas.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/xutevefagaz.pdfIn PDF document text
    • http://nessium.net/userfiles/file/99114917790.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/97684963287.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/80952951786.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/nabubowifovexij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=half+life+gmod+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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10408 bytes
SHA-256: a52b55859af83453680e602f2b3fe7e53cd69618c620357f8c3aaab9c06a4e7f
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 18788 bytes
SHA-256: cf187563426194f9018a46a4f4ac2df35114690be61103255ed5a82e425e9b12