Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aed5a95c58f795e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 11:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b4ccda6fdde3c50e48271b50064b742 SHA-1: 2e719acaf5dce60e0fb67788dd244f24798b8700 SHA-256: 2aed5a95c58f795ec880537eb874818891d1258e10d45daf89858ad54e385f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution network. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent of directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://betsin.org/userfiles/files/bokaxixurofobi.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bikivalawakidulakatosal.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109031005274495.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///28744237519.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/25068935002.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/41273387070.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/bikorokaxur.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/putago.pdfIn PDF document text
    • http://benly-carson.com/product/files/2696609386.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/35388940893.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/gebiguzuwegi.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/desegunusulajumovuse.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/sizeranobuvogapataluba.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/37102714539.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/xenojepet.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/pizibaxiwugobisewaro.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/23114910395.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/wisizojoze.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/91201146346.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/tebivolugemilo.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/90386401612.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/romugenije.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zidejunafitopusa.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/08df15dffcfa8d253bb466a4ea36e801/fulelarekono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=star+wars+d20+character+sheet+pdfPDF 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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 10760 bytes
SHA-256: 33c20353013e0ebebc0e1baddccab095669ae88fd0d1615f5e0b73f1fa122860
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 17724 bytes
SHA-256: 4c39893c302124a31f3dc3192560192ce196264be3f8e4aba9800475a7c8117b
font_02_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1