Malicious PDF — malware analysis report

Static analysis result for SHA-256 be791fc64c2b5d06…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 08:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ee9298a90c0dc84de769ed198c29214 SHA-1: b74fd04f5131555648d099ae2853f48951014ebd SHA-256: be791fc64c2b5d06b1387cd927ce4bf8461f3fd3003655a8ef4c23acd43c4d65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a link farm with numerous distinct hosts and a 'download button' lure suggests an attempt to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious workflow, likely involving the embedded URLs to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://auburn-companies.com/userfiles/files/86524242657.pdf In PDF document text
    • http://huzatfokozo.hu/editor_up/61924790097.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/61447459289.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/12374139535.pdfIn PDF document text
    • https://seger.cz/userfiles/file/lefalekowegedapenopiviteg.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/80446353585.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631008329.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/83185437524.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/6026259577.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/xakigopejafo.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/turaxifufalejukumu.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/74948278072.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/57271137562.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/51217208932.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/gujozopebipudakitopuf.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/48055806715.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/matexazufugezufekobonore.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/12772019967.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/jujaxe.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wewovuwu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/nowajumikul.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/79004138718.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/mekazuredupotumid.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/080550545884.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/93884366041.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/83859817665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=asphalt+8+airborne+for+android+downloadPDF 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_off0000c477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 16696 bytes
SHA-256: 8ef187cf1b2575a48b7f374af48fea563f2ed9c3d03d7196b22e3a55b02f86a6
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 11008 bytes
SHA-256: 08bd26191fa9a8e178039d8721eb0b9c59f510221d5ec4c9c47a5888caffe46a