Malicious PDF — malware analysis report

Static analysis result for SHA-256 50148147a9451634…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 11:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 079064c4085632fdb1fc686e1807a57b SHA-1: 05a752cd6a5d62a3f8dfee45b2dd0b3583fd9c94 SHA-256: 50148147a945163434ed2d85623e855a8cc86ceb59eab76bf7d3f11083217cc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are structured as link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

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://chcial.ru/uplcv?utm_term=saturday+night+live+123movies PDF link annotation
    • http://naphotelbangkok.com/userfiles/files/33838081913.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/80401096893.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/14729841793.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/47095180864.pdfIn PDF document text
    • https://intersat.lv/files/file/jefomegu.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/wasozomilowen.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jitukarimaduwidulaziwax.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/33838743243.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/rerafo.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/pusilarasikusado.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/rerilawadasugegigilufuke.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/55057514739.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/81963172390.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/43497683095.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d7c9827a---mukegokuretaruk.pdfIn PDF document text
    • http://salespate.com/userfiles/file/zoruwuviw.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/sisomuvimupim.pdfIn PDF document text
    • http://nanopena.cz/upload/file/xinogako.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/69306753124.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xawupopisipanesubizow.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2070026055.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/7757197101.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/40347855058.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/47877802093.pdfIn PDF document text
    • http://forum-auto.ru/data/files/fexojijuko.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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 18616 bytes
SHA-256: b2eead84ad13cacfab65de8587bf404aac1334beddfa07e9d9c2e75dfd1f8320
font_01_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 11396 bytes
SHA-256: d922d3f43b51ee2c2872a67c119ccadc8be4fa06e70821e3a44a2845fd535f30
font_02_sfnt_off0001430c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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