Malicious PDF — malware analysis report

Static analysis result for SHA-256 535ad8d56e78baa3…

MALICIOUS

PDF

68.0 KB Created: 2021-03-22 03:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa113f574e0f9195907a1c03cc970b6 SHA-1: 6ecf9653634f1ea9fa2ddb10583f37dc877aff23 SHA-256: 535ad8d56e78baa3b924f5c072c410714681a9aa1f5b11598b24d7f0f68265a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a mass of links. The document body, though truncated and obfuscated, contains text related to 'Star wars battlefront ii 2005 pc' and 'wkhtmltopdf', suggesting a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=star+wars+battlefront+ii+2005+pc
    • http://ylyn.ru/830485879913n105.pdf
    • http://ttop-shop.com/881703629703bgkd.pdf
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/725688.pdf
    • http://podeves.xyz/what_are_the_steps_of_artificial_inseminationkx367.pdf
    • http://medolufinumul.sportsontheweb.net/fovanejolevi.pdf
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/zotipalufukazakodote.pdf
    • http://ionatr.space/bisopepusoxuferaxonelukip5wm.pdf
    • http://ranupila.mywebcommunity.org/nys_dmv_drivers_license_name_change.pdf
    • http://physcoo.com/vejugopaniwomulezeferofos1w9gm.pdf
    • http://fasekafalig.scienceontheweb.net/one_minute_manager_summary_ppt.pdf
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/robavosipudidoj-muwedo.pdf
    • http://tujubafi.getenjoyment.net/vozerufepesufige.pdf
    • http://lyudi23.ru/doduszadol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/662bf40c-0ccf-4d5e-aba9-9e2d9df18a8a/luzupojufabib.pdf
    • http://tofujuwo.onlinewebshop.net/how_to_get_samsung_chromebook_out_of_demo_mode.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_aaea24efdaae45999bc45b8b6b8a264d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7b1d6b6-b2df-491f-9687-b194d73bc7c8/49363591472.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_54676495f8bf4aa88ac523eb899a71a4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d9d64ca-b143-4b53-a723-307aa3cf0325/dell_poweredge_2900_system_board.pdf
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_c49a7fea4bd446af9d7c8603e685ecb0.pdf?index=true
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_58f46ff891024dbfa9510d7619b83957.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caca.bin
d10599ef77c2e1fa1137ccf32f6b510892268c1c45d549bea03253e18f12950b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 5744 bytes
font_01_sfnt_off0000de78.bin
f853366c9ef17def9cefd14ea27ec3341fcf99b285a3df041278b2a5f2243d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10816 bytes

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