Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f61fd12521d28f3…

MALICIOUS

PDF

87.0 KB Created: 2021-03-16 16:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baf1e1bbecca4d06ead7a8cd83bf68ec SHA-1: e68f868deee86e17a669157f4cee5f721e42e385 SHA-256: 4f61fd12521d28f38aa231a720b4a7fbb81d8fe407ae9242a8f77f4ca40b6e35
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF SEO link farm. It contains numerous external URIs, with a primary suspicious URL being https://dafemum.ru/wix?keyword=frances+clayton+primary+sources. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to a large number of linked pages, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=frances+clayton+primary+sources
    • https://cdn-cms.f-static.net/uploads/4470040/normal_605042cc58d23.pdf
    • https://static.s123-cdn-static.com/uploads/4403823/normal_5fef45589947b.pdf
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fd2de7488a19.pdf
    • https://cdn-cms.f-static.net/uploads/4465270/normal_602b03edb6adc.pdf
    • http://minesaxofunawi.getenjoyment.net/57920205961.pdf
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5fed81546b3a3.pdf
    • https://cdn.sqhk.co/nazamesuwute/UhaQdZN/highway_rider_motorcycle_racer_mod_apk.pdf
    • http://xomunuxeju.sportsontheweb.net/2011_malibu_ecm_location.pdf
    • https://cdn.sqhk.co/muwizavo/hdZST7Y/the_secret_to_attracting_money_workbook.pdf
    • https://cdn-cms.f-static.net/uploads/4496616/normal_601b4d0744726.pdf
    • https://cdn.sqhk.co/nuxezitowefi/A4gggid/naughty_boy_ft_beyonce_runnin_download.pdf
    • https://cdn-cms.f-static.net/uploads/4459326/normal_5fd156a15d689.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_601a27fd521f9.pdf
    • http://modalidetefid.iblogger.org/acer_aspire_one_722_battery_removal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://begosene.epizy.com/1200333816.pdf
    • http://juwukopegonamu.onlinewebshop.net/is_armitron_watches_a_good_brand.pdf
    • http://getuweloniwa.rf.gd/kirkland_premium_8.0_hearing_aid_reviews.pdf
    • http://zetipetarot.rf.gd/tanabosulex.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_0469adcb5a5c45808bb1b12a5aac7132.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_edc68b7d9c9643cd896dd3f9445d94c9.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_19221b3996d34277bed845a052305846.pdf?index=true
    • http://tekoboworitutew.epizy.com/titasa.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_3c333b45bd7a48cebff946e786932759.pdf?index=true
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_ffd191d13bd344b39e96c281c9ff2e7f.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_off00011522.bin
ff83f3dc7731e5178e627064cbf7fb532a09d8ea8cb73cbcfd554289884fd6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 5136 bytes
font_01_sfnt_off0001268f.bin
64cf5bc7a96ab76765fb8416870b25a1254eca21964dc2634b55d1f86fd723be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 11288 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.