Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7d727642dbd44e…

MALICIOUS

PDF

72.9 KB Created: 2021-10-04 13:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58402cf0be39f27adbaece6a8c4fb6f8 SHA-1: b4939c45a2f00a590b5e96b513ff264c0e0bd70e SHA-256: cc7d727642dbd44e40626700c78ba3a33ab715beda50795a54ab7a0af40243d3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The presence of many unknown URLs supports this finding.

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 http://lnaixi.com/userfiles/file/20210912101717_400304391.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3b07f928069a390a38a7831738516818/50012936581.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/xosegixogobomomix.pdfIn PDF document text
    • http://scarpatti.com/files/84120896876.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/noguribuzule.pdfIn PDF document text
    • http://maidichike.com/upload/files/kozolopaf.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/litedetop.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/purasivukupesadugovitoso.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/14689456332.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/bigelonupajip.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/89461464592.pdfIn PDF document text
    • http://hoangvan.vn/wp-content/uploads/files/laxukezupagolejagibor.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/roxitefowef.pdfIn PDF document text
    • http://dmkert.hu/files/file/fakixopusidala.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/9662258739.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vizatebobotatejulodas.pdfIn PDF document text
    • https://pokereshop.cz/data/file/ranabodaloja.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/66269721266.pdfIn PDF document text
    • http://compsult.net/userfiles/file/55918300960.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/88683696940.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/rariropalozazefar.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9bbbdf67b---20958495988.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/juturomekinafexutelijo.pdfIn PDF document text
    • http://lex.tj/img/file/papapu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/fasires.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=percy+and+annabeth+meet+the+kanesPDF 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_off0000baa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA0 16264 bytes
SHA-256: 4d2f9b0d511f51362190520f710553b41eeb38a0ecdd2bd0232c8251789830c1
font_01_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 10724 bytes
SHA-256: 39c9dcb2857916b3592fb0a15ed94eaca6ffb77ebc96a8219464f0801ff4cc77
font_02_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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