Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e44472b9a9b6b6d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 20:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1a8896d44d9ea584786f604f6e9f1ba SHA-1: dc29d652adb1c3b94cce5f9528905bfa2bd663ca SHA-256: 8e44472b9a9b6b6db17e0a30ff2675186e6e4da628f515fba09a0004887b6440
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with an action trigger, designed to look like a screenshot, directing users to external URLs. The presence of numerous links on disposable hosting further supports a phishing or malicious download campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=testflight+equivalent+for+android PDF link annotation
    • http://dailyxedayhang.com/userfiles/files/32235101147.pdfIn PDF document text
    • http://digifast.cz/userfiles/sewaxoparoj.pdfIn PDF document text
    • https://steammining.com/userfiles/file/digeguzimabojaratipup.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/fabuvamifodujujefimidoj.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/lusasakoj.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dowedunamujakememotar.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/21148567950.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/ribububonibuxarezuvowa.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/pumitadenu.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/5232956191.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/kunabupumotire.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/38751167929.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109160536529436.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/248046324.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/87286926345.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/bovunawadejapubeku.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407d19b0d76---8966317446.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9b43bd2cb4d6ea6dd767f8e390c93ac3/wadebarimonulomog.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/29902838178.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/72744418769.pdfIn PDF document text
    • https://rotitelor.com/contents/files/gubilivitujaxege.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/pidodavagedafot.pdfIn PDF document text
    • 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_off0000acef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 14308 bytes
SHA-256: 7818d9dbe08ca2807485c7718ac9c60ee54d06e93a49f2a5e07dc05b18ce7793
font_02_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10908 bytes
SHA-256: 41076a1a760d4f7148614e7e7a866654c85f6ad371fe6b5e458dfc3ee6262ab3