Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9b7d946db541bc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 04:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7165ccf8477df6b2de45554449ef8a3 SHA-1: 1f3a0db376305ff9bc80552beeb5a4f909c652bf SHA-256: 3c9b7d946db541bc94fcc981e68e463d67bf084f04364d90a64768f4ed6cfb29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic identifies it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://jjpremiers.com/files/gulibatikizu.pdf In PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/gekejefolakikebovok.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910100008574380s1yuc.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/tiwovadeja.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/nafesevawinegojudewaxonup.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/59123294308.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/nabesufatutuluniv.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_095856.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/24071172561.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jebirojosobibubexaberej.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fadb816e1---40956205896.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fuzadabetobasuvujifu.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jarokejiveredunikir.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dc8987a3e6e73546a57b16b4ab571a6e/17236582806.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/34541170173.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/seliwosorilowumojoge.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/31302342419.pdfIn PDF document text
    • https://successalpha.team/upload/files/57964451463.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/ninurez.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/pubegevoxub.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/puguza.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/86375501622.pdfIn PDF document text
    • http://panteres.com/files/files/gedakiwifepuwedaledukixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+heartgold+soulsilver+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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 11040 bytes
SHA-256: 526793d774984cbeb3e96456c3f3d91327af9239db8d49c719f1758999dbd0fe
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 18760 bytes
SHA-256: e7137011ea6a6c548652ffa1500cdf329e80bb5c815632197b9bcea9de337b3c