Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9285df01e6bafc1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 01:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad8242b484cc5c5d34f42f8cac7641cc SHA-1: 40f47c3bace53e6c6b692c90f2bb6a5e79f52271 SHA-256: b9285df01e6bafc159c48d348bc0b1019c201367ad916b67918042a32476a5e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are likely disposable. The presence of many unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://karatenarrewarren.com.au/ckfinder/userfiles/files/77779928819.pdf In PDF document text
    • https://baglab.pl/galeria/file/16417637481.pdfIn PDF document text
    • https://podimercrm.com/img/files/zaweg.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jawulidelariwulirilese.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/96582020638.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/juzopetof.pdfIn PDF document text
    • http://technocom.pl/editor/file/28349458552.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/46696886422.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/7129697022.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909003005.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/82842729353.pdfIn PDF document text
    • http://mc-opony.pl/files/file/fewerinudodizimevowelizax.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/78810283844.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/setutumupigevikikoboditi.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/mogona.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zakapimijuribadoso.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/13628005098.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44b85aff7---binogukewenesufuxatinugu.pdfIn PDF document text
    • http://youil.org/userData/board/file/movugudodu.pdfIn PDF document text
    • http://teraval.cz/res/file/kikugofazekoxidofopam.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/32139808499.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/gobebutomurevivamibax.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/68410689107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=qdomyos+zwift+appPDF 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 15336 bytes
SHA-256: e493282db145d94a67e90ea9b8d0c05d1392efd74d50ff122a7ee4090d91542c
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 10596 bytes
SHA-256: e6477b37f30c0ec20fea1a68d5de16f69992745d9191f7ea091bebb49e6bedea
font_02_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1