Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7d540deb2d4497…

MALICIOUS

PDF

84.5 KB Created: 2021-03-23 16:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6fe41f9767cd54243b2fe99b5b4135 SHA-1: b5edb736af46d856e9575e92d9fb0bc2cb124188 SHA-256: 7c7d540deb2d449799907ed45ec826f73ebd4b4242409ec528c7f2bf4de99974
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'nipisod.ru', which is suspicious. While no scripts were extracted, the structure and the presence of numerous links suggest an attempt to direct users to potentially malicious or deceptive content, possibly for SEO manipulation or phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=calle+y+poche+libro+si+si+es+contigo+pdf
    • http://myimperfectmomlife.com/why_is_my_thermostat_not_turning_my_furnace_on3zt79.pdf
    • http://gloslides.com/38685245592s9j8m.pdf
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/37c9e5d2b021ea7.pdf
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/laliwemumajez_fivilujo.pdf
    • http://top-agent.ru/metformin_for_pcos_2019mveuk.pdf
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/0e264aa5.pdf
    • http://wurigebabisu.iblogger.org/biblia_reina_valera_online_amen_amen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8bfe0211-f060-4c78-99cf-5b2335dc6c99/how_do_i_find_hidden_pictures_on_my_phone.pdf
    • http://sokurunofizune.rf.gd/satb_pop_sheet_music.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_4ab0524e3827494696987f533e2d04ff.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_4e5beaa26c35408781f23cd4332e3c60.pdf?index=true
    • http://rutenodisekorin.rf.gd/wellness_recovery_action_plan_template.pdf
    • http://monudaduxafe.epizy.com/nozun.pdf
    • https://uploads.strikinglycdn.com/files/33d17670-118a-4867-b4b9-a9c3cf79b4c6/lifetime_basketball_hoops_in_ground.pdf
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_d4163439a6014d3db411b439a8d0c1fb.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_e9c0daf9e6a54ac6ba8028a223d0d30b.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f2.bin
cbd1d883171ce1dc069cde05c76f59a7a424d93a4fd36629f98e2b0433e47ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5472 bytes
font_01_sfnt_off0001037b.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 2140 bytes
font_02_sfnt_off00010d55.bin
ee42aad4adc098a129e65b03f0bb9e61a9f5508222e17c44718c05acaedd5d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 11932 bytes
font_03_sfnt_off0001341e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 4324 bytes

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