Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf911e30e7eb47c2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 06:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56e780b37bd0c1b79b5f81278ddcb1c4 SHA-1: 628c00d5b58de27c2af5a8330ed05d1e8523f9b1 SHA-256: bf911e30e7eb47c21860473a52439500b7b92b2a90d2a2953f9f796e808eb571
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple high-confidence heuristics, including an ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URLs, many of which are unknown, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://clubslotalmatriche.com/calcas/file/29061909137.pdf In PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/30762932993.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/97413132009.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/10158701198.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/42423889541.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/jonedodabarajewekaxijur.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109060659043312.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/82642839689.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/disaroxofumo.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/burekuvamojijisef.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wakotusobebepamefosawisi.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wuxegugugukiv.pdfIn PDF document text
    • http://hongdacable.com/d/files/59873193109.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/sakopekaziruxumukoluzoke.pdfIn PDF document text
    • https://scalper.ir/data/files/file/87775207905.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zusuwewuxojawij.pdfIn PDF document text
    • https://apra.pl/files/file/zumuvejo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/85879292718.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/feforideludex.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/gesukizono.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137837c94418---kiboriwodavenapijasok.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/90194155860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=moving+to+new+android+phonePDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 17384 bytes
SHA-256: 7ee3a8894d9a9d11f1936d949c707d74e2508c866157a38fe709dd34e77dce08
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10604 bytes
SHA-256: 056678ef980e7d2175181e70372dc3fc562ba7c7249eb78caf4a25b6f0c80745

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