Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c562856e1ca950…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 20:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 759b1154611f9fb5b60ad85d61302bf3 SHA-1: 8a24863ec3713882760892220fe5c5fabd7d87c0 SHA-256: 88c562856e1ca950404fed386cb34d630ec8238b6cfa49a1142b29bc781a1123
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a tactic to host many distinct links on disposable domains, suggesting an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/20226bfc0fbe7e7c865008ad040f851f/nesasuwefumokel.pdf In PDF document text
    • http://finadev-groupe.com/userfiles/file/rimoduvemozuwub.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/797528169.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/64747220846.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/xogubiro.pdfIn PDF document text
    • http://surausa.com/uploads/files/rulewer.pdfIn PDF document text
    • http://labradory.pl/file/dujeb.pdfIn PDF document text
    • http://15881588.com/ckupload/files/11407214728.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/tudopivosid.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/94036411729.pdfIn PDF document text
    • http://terminsk.by/pics/files/kubitekokumuse.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/bazorobigapitamunufopisok.pdfIn PDF document text
    • https://andhimazhai.com/images/files/4771659887.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///losadotejusalulun.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/41826790021.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d310b6cf2---90581774849.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/87822226051.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/653413364.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/woxezofugokokutar.pdfIn PDF document text
    • https://music-group-store.com/upload/files/ledabowi.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/85674533852.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/94217531178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+draw+a+fish+easyPDF 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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 10492 bytes
SHA-256: 80bf648510a370016b94bc9f56883026f06f0e4c0336e784c31f8d0d348654ff
font_02_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16524 bytes
SHA-256: 4897e61f386568b72d52f997141529bfbc695adf200cf9eec954dfa36ae5a67e

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