Malicious PDF — malware analysis report

Static analysis result for SHA-256 db70b202e772f525…

MALICIOUS

PDF

70.5 KB Created: 2021-06-05 22:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66c18a4a233333abfb90cc4273f0f514 SHA-1: ddafd1e90c357207c0ebf0211d3035408651b750 SHA-256: db70b202e772f525ce8bcc49b67e91ab3ebdf9ccb17c6887dfe1edfaadd7f025
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content.

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://pixomot.ru/pbw?utm_term=solving+trig+equations+with+multiple+angles+worksheet+pdf
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/7218639.pdf
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5fdd33e16034b.pdf
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/nunafi-sekusereteded-jumovike-wibod.pdf
    • https://cdn-cms.f-static.net/uploads/4462065/normal_602b069ca4e4c.pdf
    • https://cdn-cms.f-static.net/uploads/4488335/normal_606ea5e58978b.pdf
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/zugipog_nizazem_sanavezikolad.pdf
    • https://cdn-cms.f-static.net/uploads/4378170/normal_60551809733d8.pdf
    • https://cdn-cms.f-static.net/uploads/4377400/normal_602cd7a41e7da.pdf
    • https://cdn-cms.f-static.net/uploads/4489607/normal_6032afca8afe9.pdf
    • https://cdn-cms.f-static.net/uploads/4380522/normal_601e0c92361b6.pdf
    • https://cdn-cms.f-static.net/uploads/4427085/normal_6062a00648237.pdf
    • https://xelokadidato.weebly.com/uploads/1/3/3/9/133986733/dofimopus_gafivulim_jaxurivos.pdf
    • https://cdn-cms.f-static.net/uploads/4470399/normal_6013064ceb25f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jetubabup.pbworks.com/f/how_to_setup_chromecast_on_iphone_11.pdf
    • http://vifogajo.pbworks.com/w/file/fetch/144483903/are_there_carbs_in_bacardi_limon.pdf
    • http://vananizi.pbworks.com/w/file/fetch/144629853/army_pt_uniform_regulation_temperature_guide.pdf
    • http://gonumutat.pbworks.com/w/file/fetch/144495282/99676676587.pdf
    • https://uploads.strikinglycdn.com/files/520fde11-6254-4157-be43-a87a94c1a5fb/mopukebodovimameza.pdf
    • https://uploads.strikinglycdn.com/files/1a9e3680-4aef-4ece-837b-6a632762a422/pakibumazu.pdf
    • http://tereburokofe.pbworks.com/f/relationship_between_social_science_and_applied_social_science.pdf
    • http://mikabipi.pbworks.com/f/dream_league_soccer_2015_apk_hack_download.pdf
    • http://jutifakukap.pbworks.com/f/42915956802.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_off0000d4fe.bin
39f918771d3af14fd149af289c36c9ef46cab088b9eb2862d54ef85b7af90314		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 5900 bytes
font_01_sfnt_off0000e8f7.bin
d253607ef07789ed553c2fda5b75430d8944623a59451ee3416a6a206386b5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 10236 bytes

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