Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9c68b3f077dcf4…

MALICIOUS

PDF

83.1 KB Created: 2021-05-22 14:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a93eb2c7514f763a74494eaccc38b85 SHA-1: 214e638a549903c257f97222e319424fff389106 SHA-256: ee9c68b3f077dcf47cc4af52ffb7ca80f201f0025b97463f505cec6942c5ab9c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to drive traffic to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/strik?utm_term=clasificacion+de+los+equinodermos+pdf
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fe279ecd3c05.pdf
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fcc283b5fda2.pdf
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/2995950.pdf
    • https://cdn-cms.f-static.net/uploads/4485162/normal_6032bcd7b4966.pdf
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5ff17e757f7f6.pdf
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/kizax_wogivukubex.pdf
    • https://betagoguf.weebly.com/uploads/1/3/4/6/134668965/8c115e94fe152a.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/xinulopasapoz-tunikir-gelisi-vimibenu.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/157a643.pdf
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fde72f139c16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixuduwonifa/carta_de_alma_ata_1978.pdf
    • https://s3.amazonaws.com/nefomojuwet/todd_lammle_ccna_200-125_ebook_free_download.pdf
    • https://uploads.strikinglycdn.com/files/ec7eb37f-6a61-4a7b-9f1f-251334b3fa3d/velagamobovesozowowip.pdf
    • https://s3.amazonaws.com/kovilowab/android_studio_debug_next_line_shortcut.pdf
    • https://s3.amazonaws.com/divikufifir/plantronics_backbeat_go_2_wireless_earbuds_manual.pdf
    • https://s3.amazonaws.com/ragejufa/mupufemawubobapixuwudok.pdf
    • https://uploads.strikinglycdn.com/files/25c078eb-ff49-40f0-8fba-4a5db432f0c8/vawisadipagoku.pdf
    • https://s3.amazonaws.com/vefagotoje/dozenazubilorununapi.pdf
    • https://s3.amazonaws.com/bofake/strength_of_materials_notes.pdf
    • https://s3.amazonaws.com/nevovumowa/inflexibleyogis_flexibility_guide.pdf
    • https://uploads.strikinglycdn.com/files/3c79394d-498a-4056-8ac9-2ad8022bdd34/software_architect_jobs_in_bangalore.pdf
    • https://s3.amazonaws.com/wuniku/guideline_hyperuricemia_and_gout.pdf
    • https://uploads.strikinglycdn.com/files/a20236f7-0c3f-49b5-a9d4-c41a9dcb8d2d/buxixivom.pdf
    • https://s3.amazonaws.com/votubukaxogilix/zunuwojejufabelusotipudi.pdf
    • https://s3.amazonaws.com/wovitiku/17985309375.pdf
    • https://uploads.strikinglycdn.com/files/32b17a2c-b186-40a7-9c90-ac7dd3d28db6/malowibafulonikukavafetex.pdf
    • https://s3.amazonaws.com/pirofopafu/xuremovala.pdf
    • https://s3.amazonaws.com/gurowozenupifi/lufowipejiwisarotupisowix.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_off000107b2.bin
435de62b8c228e843cd1b35d22c1bedbca54e9a41568d823260be43f9a69deba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 5332 bytes
font_01_sfnt_off000119b6.bin
9a508b8ebf916662b2d6ba963b0ea1e0d0a8395c2fa567aade7cf0dc01793074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 10796 bytes

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