Malicious PDF — malware analysis report

Static analysis result for SHA-256 824d2e2cfab9d52b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 00:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f992804812001d88c8f4378cb7183c9 SHA-1: c5ed09ff6942bd2715600f9edc342454b3f425b3 SHA-256: 824d2e2cfab9d52b2251fdc1fc9cca7cfc2360c1a72168299dc8fc7ec0707cb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=watch+masterchef+australia+season+13+online+free', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=watch+masterchef+australia+season+13+online+free PDF link annotation
    • http://sushibelovo.ru/files/vokazukunedogix.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/dudozijagerovelofadasi.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907165738.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/pomamagi.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vusurodivo.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9792663345.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/51959425428.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/tagufarawifovewasujusim.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/zibijube.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/vosawosagiwanoras.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/59137972944.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/wexedorowidibawew.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/suduva.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/guzudowuwonokefetedaba.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/mixuxopewalalodamozojiv.pdfIn PDF document text
    • http://besteva.com/upload/files/91484447716.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/64603686822.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ve79jv42i4m4lqmgjuerd1lm4l/48537917108.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rewoxekurotifuwinixuk.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/jujimuwiwogodadoworipejup.pdfIn PDF document text
    • https://totounited.com/contents/files/26153436556.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae59aea69---84678404889.pdfIn PDF document text
    • http://logicamail.it/draft/media/44032119440.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/38389545805.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 17288 bytes
SHA-256: 3f0798a037084072c89473a31eca9b22ecb39ca1bfc22c0a78ce628315784ef1
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 10916 bytes
SHA-256: 9818d5d070c2adc68b71a7f59d700eba057df83697ab1c5a71411068462f6ebf
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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