Malicious PDF — malware analysis report

Static analysis result for SHA-256 38107f03b5f692de…

MALICIOUS

PDF

88.0 KB Created: 2021-09-11 01:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe7379e91e2087ef6a9c0d83f9417c3d SHA-1: 5092e242760b84d9b5eaf86aba47f3b52a197ff3 SHA-256: 38107f03b5f692de2dca407092a4ce89fc78d438ef24547137d7a13f8af74b58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=instagram+perfect+liker PDF link annotation
    • http://norilskgu.ru/userfiles/file/kapidiju.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/vexavubixeririg.pdfIn PDF document text
    • http://asqcert.net/files/files/90683031450.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/bepisuk.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/81568215278.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/72635083146.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/36454022581.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/penadi.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/satisiboraxezojulebezuk.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613888934f2fe---60660007616.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/54710634166.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/tipikizixebu.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tabananedofilazobewarax.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/30881785790.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/tedukiput.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/96671871934.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904062223.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/33243144181.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/dc66de708e23304b65a6b590b9214093/jukovado.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/xivabos.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/tajinewapinupupinasa.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/tejiborofoxoxabaxosuj.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/nowewilelelevon.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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10744 bytes
SHA-256: 13f79fa399b11f6edc568b87ccb353dc2d35b4a2fefd4ee82f2e583c7774683d
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 18284 bytes
SHA-256: fae102d917a8242af3f7f545142463dd02020350d29737cf8c4e93bf90f81a77
font_02_sfnt_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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