Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05608113befdd3f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 15:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9999e6247471fdf457307de17c6b2be3 SHA-1: 2af3ee45a6c6354082766fbb0e245dba14924b7d SHA-256: b05608113befdd3fd4a42ecebe442ea83bdcf2aa314210d2e971fde8649d8318
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sdv.sk/userfiles/articles/file/64029434204.pdf In PDF document text
    • https://xanbiente.de/userfiles/file/75293893581.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/13822255061.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/97281852577.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/48006674836.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/jasofukirukabogefetubi.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/nevumunipexenunejadu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xulusogora.pdfIn PDF document text
    • https://finliz.lt/i/File/miwanup.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/metikikunotipuwimixezotep.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/vosadezapixevefini.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/75011860131.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/gasovifizekajaxe.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/16420256902.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/29808236344.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/816409139.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/88061317675.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/58760182562.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/18613182147.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/zofirogowivujusuva.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/tuvebenosajivujedoz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8899ea6---70952933677.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/gikulajatojelogovulixuve.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitibezu.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/zigatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dictionary+letter+hPDF 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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 10276 bytes
SHA-256: 12999fa0697f57f21f50acc0d6122f6715d92156e5bac118a596e42949f1f703
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 18636 bytes
SHA-256: 82d4ea5399ca590a5897dd2d606cdecc9ce5344ea295384ff6bc08dc363acb0e
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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