Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b586aa9d11a07b2…

MALICIOUS

PDF

74.7 KB Created: 2021-03-31 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7797af67b0225e14a6ff666f18ef76c1 SHA-1: bc7599d099ae60100ea9849c0d1b3f10c78b25d8 SHA-256: 2b586aa9d11a07b23599a0f8978434c3b8983e0127f19da22810b6dc18b3f0d2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary URL, 'https://leonvi.ru/wix?keyword=preying+mantra+snapshot', suggests a keyword-driven content generation strategy. The presence of ClamAV detection and ML classification further supports its malicious nature, likely as a distribution point for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/wix?keyword=preying+mantra+snapshot
    • https://sutomoloxoxe.weebly.com/uploads/1/3/5/9/135986515/018fb5f9ff.pdf
    • http://899themes-demo.ru/how_to_study_for_nasm_cpt_examy4okg.pdf
    • https://cdn.sqhk.co/varugefezum/ibrPliR/california_camp_fire_news_report.pdf
    • http://wivevemeb.scienceontheweb.net/seguridad_jurdica_unam.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/wepinolejefoxi.pdf
    • https://mozalotajevel.weebly.com/uploads/1/3/2/6/132682758/9174925.pdf
    • https://cdn.sqhk.co/benibavagoge/gjicjeb/difference_between_plants_and_animals_kindergarten.pdf
    • http://rkconstructionsucks.com/jirowopefemiofy9l.pdf
    • http://cactusvpn.live/pozidonirakavupapazamin0jjb8.pdf
    • https://cdn.sqhk.co/nukusigemug/jj3B7HL/latorobamebegorixitab.pdf
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/0a8f7.pdf
    • http://fisareboveda.getenjoyment.net/how_to_get_google_maps_to_update_street_view.pdf
    • https://cdn.sqhk.co/xaselavub/Mgd4bgh/indycar_race_today_live_stream.pdf
    • http://poverkavoda.website/video_sites_freejzqr5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_46d70c1c2f8e4a9ca9656e84012f1774.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_a645cea65325427f8ce737469ebd1949.pdf?index=true
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_adbfb2cb4bad4d2fbf35d80d3326a76d.pdf?index=true
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_ca836754f7c4441094b779adde467cbd.pdf?index=true
    • http://gukutimaguvuzum.onlinewebshop.net/restaurant_business_plan_examples.pdf
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_0231587a83624e1c9df9c0ae2fb6a552.pdf?index=true
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_e40ff121170a4a93b1668f740bf58dff.pdf?index=true
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_78559ae66adc43bba51f0cbcd444da26.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf37.bin
153688c49e8c3e04ff3b2bf24bb863b6626dfc6f04627389f9893c91c1e6088b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 5304 bytes
font_01_sfnt_off0000e11c.bin
7fda84dfbb611a348dc579fc1e0102a6c8f3320e0acd35a9e5a19f9503447f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 11564 bytes
font_02_sfnt_off000106dc.bin
fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16084 bytes

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