Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb8206e6ea56724…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 19:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3deab355ed97fa6ab82e95df8335d43 SHA-1: dc0273220c21398be612617bc94994ed84f79fd7 SHA-256: 5bb8206e6ea56724aafdbfcbb6cb5a4a9375830632c0670f3a2d2b00e564ee4b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=how+to+cite+a+photo+in+apa PDF link annotation
    • https://parfumzone.ro/files/file/24658488618.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/viseron.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/lidogotazo.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/42715095612.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/14681679096.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/rivararabovetidimovog.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/bevimupuru.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/kesuzatetika.pdfIn PDF document text
    • https://makenie.com/upload/files/80240273166.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b5250d0---namenodugixizubesozul.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/safelemosivejizesape.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zulum.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/35281459821.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/10697726190.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/pazufix.pdfPDF link annotation
    • http://ferien-in-zahren.de/images/file/ladabeju.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/52902854134.pdfIn PDF document text
    • http://innotack.com/userfiles/files/47899128496.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/gelivipavow.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e2c524ea---viwigakideripukot.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/jerakumesi.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/rujovezesajokoxi.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/27972893885.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210902010838_371350852.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_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10232 bytes
SHA-256: 48ae98d55e20328c7a9f34e2510cf4e853bc11b40bef950b2dd250273c52bfc5
font_02_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 16736 bytes
SHA-256: 16838cd646569a87c04d9ca9e3ca02d90eaacf3dea36f68d2322dee4f0856bb1