Malicious PDF — malware analysis report

Static analysis result for SHA-256 3898799982fbadc3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 00:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37676b40b5c8ea9d801ba87d62809902 SHA-1: 30ede9d915608a041005c998c50cb0e0928c189e SHA-256: 3898799982fbadc344734dfb310abddf2c5187ca27306e3b7a7717899459854c
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous distinct hosts and links, many of which point to PDFs hosted on suspicious domains. This suggests the primary goal is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sxsasa.org/images_fck/file/1630822774.pdf In PDF document text
    • http://csc-0898.com/userfiles/file/20210910215331_ejzxxz.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/58051911253.pdfIn PDF document text
    • https://gornjastubica.hr/files/8502750473.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/77587004814.pdfIn PDF document text
    • https://sergiomauri.com/images/file/raforuloza.pdfIn PDF document text
    • http://ruihuitax.com/files/file/64431856533.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/22062286764.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/8513674098.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/35245571766.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/2443844319.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/zapal.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/ninulopijupigabog.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nidikunelasakuwukubukawe.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/wuwijanitovitujenofowuv.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/47869893178.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/duzokizotivegozomatidex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd6014036---7403853125.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/85203452378.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c595c62411---nefefadogolefuwesenog.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/vufufali.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/10439252872.pdfIn PDF document text
    • http://limoride.net/gallery/file/27103637944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wrestling+revolution+3d+hack+version+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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16932 bytes
SHA-256: 8b12806dd3da5187ee4364a0c7b22ea4637f1b18563f3e094533c5e0c7977dd6
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 11156 bytes
SHA-256: 396ea7d5d84dfe9197966ea42cba1f880e25c08931ad7175816de789dd9c1937
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1