Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2e034dfee5043d…

MALICIOUS

PDF

70.7 KB Created: 2020-11-18 12:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac357d78e010cf364760dd19e36d3e7c SHA-1: 1fb1989a4c0c0e7d20c69c552842001ef1aad096 SHA-256: 4f2e034dfee5043d55cb0a709bf35fe62193b309e335ed3fc34e47a4616261a7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to 'gunship battle hack 2019' and a URL associated with this term, suggesting a lure for users seeking game cheats. The PDF also contains a large number of external links, many of which are to PDF files, indicating a potential link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=gunship+battle+hack+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f8dc0233b44b.pdfIn PDF document text
    • https://vafomelopujoxo.weebly.com/uploads/1/3/4/8/134864043/fuzof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fa17a0648707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a1e865-89ec-46fa-8642-09831fbff475/regularity_definition_in_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36cbe34-efcb-4fce-a498-118fc38977c7/riwaferevufiseluriresetej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db115248-5b52-491c-ae5e-9c29ba5494bd/71398681664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6dcc5c6-c0a8-48c3-8469-e01891e03f44/the_lightning_thief_movie_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea1436c-3b2c-4053-807f-a33a01722adf/63458597567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43610a1f-87e4-4264-a3b9-e5c2b86ddc45/rivalumiwilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861d7fca-34aa-404f-80bb-b27b3f39e3af/foxopujuraguvatako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49f8bee-fa59-4b20-be13-20cb756dfb80/55528840092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58328401-d0d6-402b-ae1a-272a0c4750c4/11586081141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a75bb0b-c83b-4476-89d0-1aa550d1f786/xolamenijikejeni.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 5644 bytes
SHA-256: a886c8b064c84bb6555da59a9a659f4cccd386a6f5852c3832243b62d9579cb3
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 10424 bytes
SHA-256: 2a22ad3c030c9ae1c82ff013331e47d5552c08629ad7badec18579f23bbe709e

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