Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e271ebdd3da5b6…

MALICIOUS

PDF

77.3 KB Created: 2021-04-06 11:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e9cc0835c846da9eba2d25c4ce8608b5 SHA-1: 7fec4475e3bccc2aaad1e727a78e01daaa986254 SHA-256: 88e271ebdd3da5b67691f74997d59f3ad7c33a22f08a209fd3162b25a341e6f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, with one specifically pointing to a URL related to 'pdf watermark remover license key', suggesting a phishing or scam lure. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of numerous external links suggests potential redirection or download attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=pdf+watermark+remover+license+key PDF link annotation
    • http://risimog.mywebcommunity.org/gesalezel.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/af4e6e.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/vulorajawirija.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/86d25c153be6a9.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/physical_and_chemical_properties_of_amines.pdfIn PDF document text
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/wetadifowakivonavud.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/e31bad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5fec74f00ae44.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/14394543463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_6027260896315.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/bls_certificate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_6049547278ad3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/free_audacity_software_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/pilapegepinovorokazip.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/corporation_bylaws_template_free.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/circular_motion_class_11_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/burning_sensation_in_one_spot_on_scalp.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/32715602604.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/espn_sunday_sports_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/kenem.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 5488 bytes
SHA-256: d7dfa506e808ba10c9aa85f883459939394ccc0da4b323a62c43dd4d57d7e122
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 11048 bytes
SHA-256: 2227ffc62e216987f6f8c1cb108c930a330c92b553609a89765abd8c56621d4a

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