Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc80894743b41c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-20 14:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e426bef99337e1490be17c4f31c5b9e0 SHA-1: 57ba1e6415c703e08ccbca4c3edd940570faece6 SHA-256: 10fc80894743b41ca36ed58c51e442bdd64a51b18ec5c5be300d7611c3c8331f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded URLs and the PDF structure point towards an attempt to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=libro+evangelismo+personal+myer+pearlman+pdf+gratis PDF link annotation
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/9429464.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/fogof-mekawitofata-sugabepukegezom-vijevo.pdfIn PDF document text
    • http://rutametigaw.22web.org/majestic_gas_logs_repair.pdfIn PDF document text
    • http://papamoxi.iblogger.org/novela_seda_alessandro_baricco.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/KKhjghW/the_yellow_wallpaper_summary_cliffsnotes.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/0ggj9z7/air_hockey_tables_for_sale_in_northern_ireland.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5ff980d413d51.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/jd3iiha/cumberland_community_school_sd71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fdfd2de2f375.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/jhjjbAb/44662227391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_601085799cd6c.pdfIn PDF document text
    • https://pudebotajiv.weebly.com/uploads/1/3/4/0/134012430/nujomasi_tizerovaxijuti.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/soxejige_jinotuzodetules_wazomipadopuj_derodibutibixaj.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/3886082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5ff0486462aee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ca4f4ae07d914717b1493398142fb39b.pdf?index=trueIn PDF document text
    • http://lukegijabezul.rf.gd/gasalez.pdfIn PDF document text
    • http://roxifopovarag.rf.gd/cherry_blossom_background_hd.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_b0a17c2c680349f5bc006644250e2bb6.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_9455fe71fb00469c97efbc3f43bbd101.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_5d76c25c046c4fcbb7bd05b603b40382.pdf?index=trueIn PDF document text
    • http://lunipadudatib.rf.gd/how_to_pray_for_rain_prayer.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_a250ddbbdeaf4307ba6f7e234eb6e77c.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_d42ebb3815304538afb7bfac201715c9.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_5485ada48df84606aaacb6263a0a1b3d.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_33d4871327aa44afa3e03f0ab4b98677.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 5604 bytes
SHA-256: 225b9876dcb7195b6c74edd421e8888e938261365a135d19df0b98399b8e7e9a
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 11008 bytes
SHA-256: 04a2611779620f2c24e6c6100466580c1284684981ee2b7b46450f7421c966d1