Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19452f9b50cf1ad…

MALICIOUS

PDF

76.6 KB Created: 2021-09-24 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a432cd7281002686e2e9a38a23395b9c SHA-1: 8f71c5f9a5715450a125a8ce94bd2e2fbaeb6745 SHA-256: f19452f9b50cf1adc4d8961753d85e809e0e01079ae1c7cc82e9b80ea7dd9588
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristics identified the document as a link farm, with numerous distinct hosts and embedded URLs, suggesting an attempt to direct users to external, potentially malicious content. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rtquery.reitoken.org/Coaching123/images/files/95754964136.pdf In PDF document text
    • https://polnische-zaune.de/userfiles/file/12088433958.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/777357948.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/56308975153.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/kisigugenodon.pdfIn PDF document text
    • http://belovosushi.ru/files/7936495762.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/97314583768.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b679a3b822---31741126392.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nemukerepobajejoti.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/wupupazugalinudosazaz.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/36164830267.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/vekuji.pdfIn PDF document text
    • http://otoform.com/upload/ckfinder/files/28652740835.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/melefigepit.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/pewuxomele.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/zofajiv.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/mibukegu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/47827364668.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/16624588266.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nabipuzevirubatitafurofu.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/4091634912.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/peminuwarusonizex.pdfIn PDF document text
    • http://esipro.be/userfiles/file/rinabadibesakolexizudizi.pdfIn PDF document text
    • https://o-dance.com/upload/files/17138395346.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0af21333---kewaborotuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+joy+of+creation+apk+downloadPDF 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 18512 bytes
SHA-256: 6ef32abadf6d96336633c44fd973fd8abc8e69a50a7a22baa04d5c5bd35a6958
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 10936 bytes
SHA-256: 936475216f8b14066827f750c8c4935036343535b9b4d789f2a4663b2ac56281