Malicious PDF — malware analysis report

Static analysis result for SHA-256 da629aee146e2e0c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-24 18:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5e5d703e3fe523eb89b2fa6ab327676 SHA-1: 7f5778343fc9fd376726104fbb98ba753a4a2a3d SHA-256: da629aee146e2e0c076f7f3f4ba6cc6fe167eba179644fb126362ccf59b36e39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to external content, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=is+geha+insurance+part+of+unitedhealthcare
    • https://cdn.sqhk.co/roretuduva/ajbdWgi/96640993621.pdf
    • http://beautysss.site/polanyi_m._personal_knowledgewaex4.pdf
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/da72f50391.pdf
    • http://nuveclovet.xyz/free_photoshop_training_videos8fffo.pdf
    • https://cdn.sqhk.co/juduxijumijo/cggRaha/amazon_a_to_z_app_download.pdf
    • https://tuverasoxodos.weebly.com/uploads/1/3/4/7/134745130/tegalojobitu.pdf
    • http://smeh-mif.space/21908905495lrkb0.pdf
    • https://cdn.sqhk.co/sevigexew/EjbNepH/seven_letter_words_starting_with_ex.pdf
    • https://cdn.sqhk.co/wuxaguzifep/jiFdpKD/vesta_sw_cross__vesta_sw.pdf
    • http://smotrikino.fun/bulova_precisionist_x_limited_edition6xev2.pdf
    • http://ventager.online/edge_of_democracy_rotten_tomatoes4h0zp.pdf
    • https://cdn.sqhk.co/zafupusapun/ihghd3N/vilukojasotizozogij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d16877a3-ae83-4e43-a196-f0de66f567e7/como_aprender_ingles_facil_y_rapido_en_casa_gratis_por_internet.pdf
    • https://uploads.strikinglycdn.com/files/acd24495-a703-47cd-b5ee-9bf8b10c7787/15362741072.pdf
    • https://uploads.strikinglycdn.com/files/df2fd8b0-3cff-4b22-be4e-2beb3f63213d/nolowezazixopuzebuz.pdf
    • https://uploads.strikinglycdn.com/files/64e88b11-1770-4e36-8b42-22817bf164f0/22355618748.pdf
    • https://uploads.strikinglycdn.com/files/270b17f1-eb7e-4995-afd8-7e9635cf08be/57295245958.pdf
    • https://uploads.strikinglycdn.com/files/84533753-f97a-4d3b-a467-3eba43812c43/95522631134.pdf
    • https://uploads.strikinglycdn.com/files/f47548d1-0539-4f6b-af6a-4bfaa2df4d0d/rilivovexalo.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_off0000e0e3.bin
149e54b13db9e6fdd5847736312ede48b1941cad8c8e12ada12275415f0597d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 5356 bytes
font_01_sfnt_off0000f315.bin
8ecfb3d04a595ca3006779750a9a21001f90581052ba1289052c95025184f382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10604 bytes

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