Malicious PDF — malware analysis report

Static analysis result for SHA-256 42902f8a055fe989…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 19:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8cfbe09237347d6df3ecc136aadcc5f3 SHA-1: a9709bb2a0a5e05cd0f4af5769b164b9b25079c4 SHA-256: 42902f8a055fe9893df96203071bfd1f83dda50a68935a0052bd9ae62281e3d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://crewmak.ru/uplcv?utm_term=how+to+remove+stickers+from+text+messages+android PDF link annotation
    • https://itscebu.com/upload/file/20210916154218.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/77684566339.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/vonivupaxe.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/pigulejibejumadexuzop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132009c27dc4---30650952980.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/runurefefasapi.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/zosomi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7cb867b66a8328f6d3b3321b6cc23e59/tevivufegotubi.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/93970557226.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/xiviwajisibekamo.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090917314928265.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/93399522585.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/xebopulol.pdfIn PDF document text
    • https://gameclub.by/uploads/files/tisuw.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210917004423.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/61625162273.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/28944970140.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130a7ec19c---75808084049.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/fiwuduginala.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/64046347003.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/83726041715.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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 17924 bytes
SHA-256: d35c27b9851cc13d23368d406f81dedd2b5dc3b21a830ef5b76a3743f4b22199
font_01_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 11112 bytes
SHA-256: fa50c433b1dfeaa3d85e1d8674facd63e7ee48499032f668c08efa013ba71b0a

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