Malicious PDF — malware analysis report

Static analysis result for SHA-256 2586f63d866d4914…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 11:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35767cf144cb238f49508c870527b5cb SHA-1: 9d19babe2f1ac927dada0b6f857362dda22fe8f1 SHA-256: 2586f63d866d49149aec8e518fbd8e8fd2a62bb5704840d7b011f323d759b926
146 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains numerous embedded URLs and attempts to lure the user into enabling macros or editing, suggesting it's designed to download and execute a second-stage payload. The presence of embedded JavaScript further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://luminex.pl/upload/file/negefe.pdf In PDF document text
    • https://observatoire-omic.org/documents/file/fafunusejamuraxisulu.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/79388610630.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/kewetepiratobogulasoduno.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/woratamokijiri.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16311578341364312997.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99f8415b3---vixulurakuzovexokafabuwe.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/sarelen.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/38194595563.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/dofexosowunis.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/zuxogirimofakim.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/ruxudexenijisedipapepoki.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210917_110308.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191715425336.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/wigijifikifojowemavi.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/96761033313.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/88498605536.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/vomavexafonirone.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///zizovaleburor.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/famofinazoxi.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/nazivusupoki.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gosowebubasap.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd66e8ee3---42368385297.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/37617136420.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/kijigonufikebinetogetofij.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/35476966834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hotstar+ad+blocker+for+androidPDF 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_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 19036 bytes
SHA-256: e70b987557adc9c4d0b3bc5ab8646b9478f001221726430d1a182a9e58510739
font_01_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FA 10692 bytes
SHA-256: 26442fcaf7eb885467cb721f2c3bdcf428d09cb0fffbb198941b9c514fa9f7e4