Malicious PDF — malware analysis report

Static analysis result for SHA-256 c456a6aaa2aafdcc…

MALICIOUS

PDF

76.1 KB Created: 2021-05-25 04:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cd0d4505ef2884410369c8cb12ac750 SHA-1: e9750c5d255775372a8eab60b64936a5d5743c2e SHA-256: c456a6aaa2aafdcc325f8c2e8b1d79ec8e9efc143b64fb210d16d60fa2e5110d
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'managing risk in information systems'. No scripts were extracted, but the PDF structure itself facilitated the malicious URL delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/strik?utm_term=managing+risk+in+information+systems+2nd+ed+pdf
    • https://cdn-cms.f-static.net/uploads/4465935/normal_6033fce45aa8f.pdf
    • https://cdn-cms.f-static.net/uploads/4467273/normal_600be303a7f65.pdf
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5ff25759e2116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75ca1464-bf4a-4d5b-a00f-e5d91cf34ac4/18964715010.pdf
    • https://uploads.strikinglycdn.com/files/ce26ee80-1005-4b79-b92e-5036e125e4e5/jaxetujanuji.pdf
    • https://uploads.strikinglycdn.com/files/00398b98-7116-49c4-ae32-c056519e1d8b/zulakusazumuganimisumu.pdf
    • https://uploads.strikinglycdn.com/files/a5421f21-6378-402a-8c27-e1a7dbbd7b29/73669308971.pdf
    • https://s3.amazonaws.com/daselex/addition_worksheets_sums_to_10.pdf
    • https://uploads.strikinglycdn.com/files/19db14f8-4db7-4979-9761-316f3be6fd2e/watch_fifty_shades_of_grey_full_movie_download_filmywap.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/95086521959.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/8973220377.pdf
    • https://uploads.strikinglycdn.com/files/434b8471-567b-4c04-90a9-171981c6bd9f/37096688492.pdf
    • https://uploads.strikinglycdn.com/files/17e7f36f-d097-4f9d-94b0-cd1692808431/62799776875.pdf
    • https://uploads.strikinglycdn.com/files/d413c86f-b016-42e4-844e-cd0173aea252/bless_me_ultima_movie.pdf
    • https://uploads.strikinglycdn.com/files/ade2333d-f1fd-4f1d-b407-e45b3999304c/dudumevexekaxo.pdf
    • https://uploads.strikinglycdn.com/files/a33ed0b7-f6ea-43ab-8ea6-503f93f3d9eb/84113447431.pdf
    • https://s3.amazonaws.com/pujirageg/caracteristicas_personajes_sueo_de_una_noche_de_verano.pdf
    • https://uploads.strikinglycdn.com/files/75bbca6a-b7aa-412a-9fc6-c4be8e968833/8240814815.pdf
    • https://uploads.strikinglycdn.com/files/48e3101f-a0bc-4ea6-8715-7dd641f15114/fijiwidolavutarimewuduxal.pdf
    • 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_off0000ecd1.bin
91d8c0939ce7023e36ad4700dad4725cd3eabd9c7894f3b668d635500f01b7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 5632 bytes
font_01_sfnt_off00010009.bin
e13f15c1642aed30bb4100021fab6e487076894d9a017eb56747d23c06c65131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 10220 bytes

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