Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d228c16add8940a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab4f0a014f6b3933b83068fa26bbc955 SHA-1: 5e9dbe52b037d2f77461abd5a1d37c136ba2b53d SHA-256: 6d228c16add8940ab4887946feca5dfd939b2c6301795f13bda8ad58fe0000b6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure, but the presence of multiple external links points towards an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=lollipop+to+marshmallow+upgrade PDF link annotation
    • http://hcbarrett.com/user_area/file/50028551528.pdfIn PDF document text
    • http://caythuocnam.org/images/files/92335565902.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_092150.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/45657986125.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/85008595906.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vuxegufubewupi.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/50535223515.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7d6e14e007a2f7c96c8721861f2fa9aa/55401231453.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/fodewaxopilaj.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/45208877662.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/11247903515.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/rafukiwemavixorumoviwo.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lifoxikuwavidufasef.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/48567874954.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210918173725.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8f07bf655ce254606d2d03cf6d37fe1d/wofodejojeborojaletuse.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/52846130036.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/70987068168.pdfIn PDF document text
    • http://fullx.net/files/zokusigu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/15546303000.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/80276955553.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/jusarolituwadovewedinar.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_off0000b1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 10880 bytes
SHA-256: bafdd9f5460ae17fa2020645ba94d27d91fb76f5b2b2dc469e018886fdb967db
font_01_sfnt_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 14800 bytes
SHA-256: 7a318a1fdc4b996280ce13c3f5605316051d1dc8042db01894866b93019cc356
font_02_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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