Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dc8df051c87e2d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-14 04:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07fc0e4a81f2c83afd58042b88ab7fc4 SHA-1: ef7e6398e7f1138922f173181280679b8909eb8d SHA-256: e4dc8df051c87e2db870769a5771a635ae5c2a9acb2e19e5cda0d0ee6e9f93c4
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm and an embedded URI pointing to 'xezojetit.ru', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=south+africa+unabridged+birth+certificate+form
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600b2d2e085f4.pdf
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60110cfb839c0.pdf
    • https://static.s123-cdn-static.com/uploads/4468563/normal_6005611cd75fa.pdf
    • https://static.s123-cdn-static.com/uploads/4453337/normal_5fc9f460416d1.pdf
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5fc571188c625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_aa2dd97ae52346279766ff8dee491eca.pdf?index=true
    • https://s3.amazonaws.com/zesixefe/vazurowoj.pdf
    • https://s3.amazonaws.com/novifamigot/math-_aids_worksheets_answer_key.pdf
    • https://s3.amazonaws.com/bezegoluzose/plt_scatter_legend_color.pdf
    • https://s3.amazonaws.com/mejados/is_canon_pixma_tr4522_compatible_with_chromebook.pdf
    • https://uploads.strikinglycdn.com/files/b9cae86d-8023-42cf-a3dd-1283633f659b/newspaper_headlines_such_as_those_above_most_directly_contributed_to_which_of_the_following.pdf
    • https://s3.amazonaws.com/luxaduzimase/58204408703.pdf
    • https://s3.amazonaws.com/muvojugejoxip/arere_ekkada_audio_song.pdf
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_f48cde51e7a24b059856cc579e0d23d9.pdf?index=true
    • https://s3.amazonaws.com/vibasujefir/nogazoni.pdf
    • https://uploads.strikinglycdn.com/files/8650c155-6495-4d10-b090-d321bcd5378b/planet_fitness_gym_cancellation_letter.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_f8a28d2e30cb4814bcee6463c3d612a0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ed.bin
0f8aaf84e0d56fbe661d5907ec3af27f7d818a0dbdff7fa1f724087230037369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5468 bytes
font_01_sfnt_off0000f362.bin
d0a8ac78c156fb9477d31c866fe8ffc6c5e6816f14e098619700ede8668c4758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 10724 bytes

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