Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbbea689ba1ab1f…

MALICIOUS

PDF

80.5 KB Created: 2021-10-18 12:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5cef4bda0dd01b6d803d42daea9fddd3 SHA-1: abb7b9e0f3cf47ace6b8683c99bbf0909eda6334 SHA-256: 1cbbea689ba1ab1fb30d96491fdf31499d61e599e3134155ce41be5602c49648
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs suggest a phishing or malware distribution campaign. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=view+pdf+on+website PDF link annotation
    • http://templeton.sk/userfiles/file/22454928527.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/94666671645.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/fiwurufusipar.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/katonapazivoka.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/manaj.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/76529147678.pdfIn PDF document text
    • https://people11people.gr/uploads/File/naxeliwufusujoluwiduxusis.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/42734208498.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/xonakimijagubatorofu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210918022108_7movi7.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/jofuvora.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/patitikositagusezeb.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/45705374917.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/45081564485.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210922/file/fiwadaxalofigeledax.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/mobenojurenezidusekuluv.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/pewijorifuvuzugada.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/10642824904.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/49566125411.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/19638468048.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/37115911588.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/65212541719.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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10380 bytes
SHA-256: d76c3958d2c59123c9c8dce6208330303155460dade4625d66f209148e107a70
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 18700 bytes
SHA-256: eedc5b068172f106b33d7a9e1d6ebff0cf9bef8a006569c6897998dc828886f2

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