Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ff278fd104a262…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06071d144f37bfa9a4134f083b8b8b85 SHA-1: e87bff4485481382aa2a61923fc5f819411c25ec SHA-256: d2ff278fd104a262b7ec0007fca2508546d017d6f0392f87d872b137d4601a63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream, which is often used to download and execute additional malicious content or redirect users to phishing sites. The presence of numerous external URIs, many pointing to PDF files on various domains, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abwlondonblvd.com/uploads/files/48173082731.pdf In PDF document text
    • http://kpdb.org/userfiles/files/xodur.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/61028924035.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/japejudewufiripib.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/29898923515.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/65463265339.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/disilezumesijovojum.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fadibaguretipam.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sozidakuvisujarukewopazu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/10718980070.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/lobemijojelopikajesuzalim.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/85293243429.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/zazudosewalujolerasepixiv.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pojotono.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadcb5926c---35277620254.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/jekuzikotujubuse.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/68162919573.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nupasegufogudedemive.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/waxuxolij.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/41546660125.pdfIn PDF document text
    • https://curvy.tw/upload/files/45493421238.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/filop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+can+i+store+cooked+chickenPDF 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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 10820 bytes
SHA-256: 2ecd739d3f606a6f62af069ad56d6bc74ed8e1b16c5fe5224ae1b3d610993a87
font_02_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 17340 bytes
SHA-256: 663a3d2e144affb688fae2453d214155a03134159c9da5017767b26232c70ffd

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