Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ce30cd557b2330…

MALICIOUS

PDF

78.9 KB Created: 2021-10-04 20:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7205b1e8dd8e9996a40759a9aceaf4dc SHA-1: bc87944dd90d04576a8d8077069d3d815246a1df SHA-256: 31ce30cd557b23306de0ae572cdcd9024c575ed19aef7377213063c6a6c424b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant number pointing to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a technique to obscure malicious destinations. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://suspensionestg.mx/userfiles/file/49764352164.pdf In PDF document text
    • http://rspon.pl/images/wyswig_images/file/89455964826.pdfIn PDF document text
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/goranosimafazipirelisat.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/ralogezupovogigarad.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904215634_1610583629.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/tezemirafolijabelikagumu.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219271033134561.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20211004141155_1681133191.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/nijexikuxeru.pdfIn PDF document text
    • https://777mto.net/contents/files/tizemu.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/tupemewameruserixemana.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/wereka.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/sirejarot.pdfIn PDF document text
    • http://schokofontaenen.de/idata/vusokusedubu.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/6472034387.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vopajutakerekij.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/81966185482.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/18357003165.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/kekeg.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/19/35316206925.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/sasorur.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c0ca948bd7edb6a7312371135f4f07f1/16648297668.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/92592114349.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/68941231364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=types+of+fade+haircutsPDF 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_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 16928 bytes
SHA-256: a65cb618dc0ad1df04328fe5c95ebbb7fe30aef1263ca8d2b424227f9c4e376d
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 10744 bytes
SHA-256: d35932e7e6d51358f66f3df04524d14abb869e7e62fc3e40ff9b16db5c1d197b

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