Malicious PDF — malware analysis report

Static analysis result for SHA-256 847a18979712d980…

MALICIOUS

PDF

90.6 KB Created: 2021-09-14 13:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eba584afa3a2a262f09a59d77df1b47a SHA-1: f7f0aab237d8999761c15c1bb99981bb8564641c SHA-256: 847a18979712d98099df59fa3cb3e08cdd6b3a0e28c636027754369669c2d198
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious domains or are structured as link farms, indicating a potential phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613240f982961---63773520152.pdf In PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/bebujobudika.pdfIn PDF document text
    • http://aa-nusd.jp/50264335586.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/8000503276.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/69921644670.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7edc64a86770ec0db889360e514fe1d/pofuzomananekuwubopebideb.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/53749600776.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/3086212657.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/puzik.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/68671886322.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/53141851316.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/memokez.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/xusut.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/dulipofawutatoferolubopud.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/zoridevag.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/bimemajanajajegupivites.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/13544831780.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/50795790488.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vizulakin.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/sebazezafizupevojozer.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/20241803984.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/51581068696.pdfIn PDF document text
    • http://agavietnam.com/img/files/61354652362.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/ramogirofot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pocket+code+iosPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 20816 bytes
SHA-256: 41fa19049a710dd45fe90b2a9cc1082f2040439ad08fea904cec6015c26acac8
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10044 bytes
SHA-256: 18185118e16c0de73709d3342d64dbd2d1a18be8ff4964376f39f733577e5757
font_02_sfnt_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14430 16320 bytes
SHA-256: a61d684141661bd7e25227023c6ce57728fecc34f676d4b5e6e450b31f799185