Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4e34357d314541…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 08:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dea633c0418d128e9febcb8d0a2102d3 SHA-1: 2f482a98a8b1708d0917cc662fd68e29fe2ef3cc SHA-256: 7e4e34357d3145411a5058a53c5e58630c558b7c5f1b19a877d59bd9f439547e
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 disposable domains, indicative of a link farm designed to distribute malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=junit+tutorial+spring+boot PDF link annotation
    • http://tecresconsolidamentorestauro.it/fck_data/file/megagemufakeroxaro.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/xakubosig.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/77878799312.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/lazejabelimusadux.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/61847291620.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/wofofokemasasixamef.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161358990ed480---96806204170.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/30147386305.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/89917541950.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/76401688819.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/45466275960.pdfIn PDF document text
    • http://www.centralperdana.com/file/43474036257.pdfIn PDF document text
    • http://iscelenie.info/files/file/moroxanin.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/kabawexanikof.pdfIn PDF document text
    • http://modero.vn/upload/files/rebaxitojatuvegewererex.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zatabe.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8952da56---2678522423.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/21820527402.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021916144399180.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/72208841618.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/94390748141.pdfIn PDF document text
    • https://cardolf.ro/files/fokugujavuget.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/77483574861.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/31221468722.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/68416900974.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_off0000b29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29F 18280 bytes
SHA-256: 68b77a21666874f4070e39e9d1c2b455bdaf618556e62c21384fd66942bac819
font_01_sfnt_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 10524 bytes
SHA-256: 633d7048929a965ffaa6eea12cb211ecc3f71f7a5f4f0bf62710c52eb55abed8
font_02_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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