Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6fb521350e2d2e…

MALICIOUS

PDF

78.3 KB Created: 2021-10-04 17:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85c1e2b7ebf62c93c4b995d373c73e84 SHA-1: 4038bdd9cf7f79c0b76d9ab6ab5c60e64f7710f0 SHA-256: 5c6fb521350e2d2e48fb3ce83a6bec674f5476f4031149799f79f9d5d5dde41d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=lovely+beautiful+good+morning+images PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8be94eb7d26d54e45fe86d0053c4a34b/91742616722.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/72094522481.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/muwomoza.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/gewuludubupifabijanu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e00e1adc7---13527739274.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/betowumufemirojezob.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914001347.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/komubibipenek.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/72024977868.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gitutuvukeperafem.pdfIn PDF document text
    • http://storemisr.com/uploads/files/61429714297.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/dowevezotodanuwopadibu.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/23721480333.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/bopulozufawufifivejexizik.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/94630837428.pdfIn PDF document text
    • http://hexindechem.com/upload/files/jumuzolenelusesufapejixaj.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/jisagegeki.pdfIn PDF document text
    • https://theipbuzz.com/images/file/towefulofaraf.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pulaminilonajisenonag.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/lubamasororebo.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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 17404 bytes
SHA-256: 888004768844991bac6b11f26efed4714ac9886a0ea6c86094b781243cd55b00
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 11076 bytes
SHA-256: 819af5f82dca2adb51a16c3e64f7af23fc0d8e0d83cef983ff8b7a7d93d24b2b

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