Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83a80f33524f11…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 12:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ec608dd60d35e8a20e2707315e52a64 SHA-1: 61007e47dfee7d5b9e1fd7772067c6b432d59dc6 SHA-256: ec83a80f33524f1168e4e5714c05d5664dc2a7e5cbe16bce109cc59c65ef06c6
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The presence of many distinct hosts and a high number of links per host further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://architettoseneca.com/userfiles/files/37371941492.pdf In PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/nonewujuwizokezo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lavajigizilidade.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2845bd2cf2be477589599211ed5ce94a/87309258178.pdfIn PDF document text
    • http://otczenacts.com/media/files/19027576675.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gisujax.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/refepidusujesawimub.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4190geutfm7ovquhj7bqk1r4i0/58348387067.pdfIn PDF document text
    • https://abss.pt/userfiles/file/25674597065.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/dawijuvoninifara.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/44998511867.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/45278684518.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/35603748654.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/93042098797.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zonewimabujogoxuzewem.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/17131600943.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/12170862014.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/65635601931.pdfIn PDF document text
    • https://energooptima.hu/upload/File/ledulokifemonuvoxizefin.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/29813010528.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimezebuxigufi.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/wotawadudel.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/dabusamirigeriwitife.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/fonibozogagarijudegom.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/xunidadiladipuvevevaredo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+check+my+voicemail+on+my+androidPDF 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_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 17208 bytes
SHA-256: 837187514eb486b6162d96cd795c263b5eab58650cc362637cd88684e065efa8
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 10720 bytes
SHA-256: 17f8814dc58272e55defdfa99c29b9b25e216cdf10b03d96f482ad3d28bde1ae