Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8727dd4beb64a5c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 20:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62c9e883b2ef13aedba2e80c01fba6a5 SHA-1: a35e8c50c4f2c32ea2f3227f33be82c5227c3643 SHA-256: a8727dd4beb64a5ca6ab78793699478d2be465f1ef8f9438276777f6ed85f93c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and a 'link farm' heuristic suggests the document's primary purpose is to redirect users to potentially harmful websites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=gp+moto+racing PDF link annotation
    • http://xpeedon.net/userfiles/file/20210908051940.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021914355322287.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-03-10-30-19.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/11344244988.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/3739026409.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/38069030138.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/87472018919.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/loxetokaraxitavurukudi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614193494a941---77694959602.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/xopamanawojuzokajolob.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/70378424434.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/82461976257.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/71443740866.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109131451093581.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/81744200186.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/42046442757.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/xigusufosaramefera.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/tizumadepudevutinaw.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/94472680653.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wedigurakawoguvisu.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/84976626553.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141201160e21---39823508174.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/93067885024.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/penuj.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_off0000b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FB 10408 bytes
SHA-256: 4021c8c70f33c9abe70a009368239d34a539d7e27aa3c3151f323ed4e7bd7b42
font_01_sfnt_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 16592 bytes
SHA-256: 8e18f6553f21441db3075408f2db61f774d07c41c46568696ac5d3aafad3376c

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