Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e46664eb4544e41…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 20:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e3793fc039e3ff8f797c885d029a690 SHA-1: 937f73ca87a483f3c7b5eead9d8e7efde7654bdb SHA-256: 4e46664eb4544e41a39c27efe567d7f81f99ba2a7cdd06c0de24504149dcfca4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' specifically flags a large number of generated SEO PDF links. While no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/wix?keyword=words+that+start+with+c
    • http://zokidinodajives.getenjoyment.net/suzawag.pdf
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/nebesupez.pdf
    • http://xelamoxadavas.mywebcommunity.org/88404087105.pdf
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/2c77e1c1.pdf
    • https://tarutugiwom.weebly.com/uploads/1/3/5/3/135326066/jimaki.pdf
    • https://cdn.sqhk.co/fumamimed/LgdhayB/text_twist_word_games.pdf
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/kenoxibumojoxus_xewut_vavepufevafi_lewavujokabe.pdf
    • https://cdn.sqhk.co/ludozenidi/Jsiacjd/the_trial_of_the_chicago_7_review_variety.pdf
    • https://cdn.sqhk.co/jerivudofin/8Rhhfhd/jelofavexafobenax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_7deb8fc850e24189adab5166bc114f14.pdf?index=true
    • http://jokosen.atwebpages.com/gazunaxesujasuwivipinud.pdf
    • http://sifebitufol.onlinewebshop.net/byju_s_ias_current_affairs.pdf
    • http://bevivex.rf.gd/numipewuvajaponosomadof.pdf
    • https://uploads.strikinglycdn.com/files/ae6626ec-bc9b-4c70-9c2c-ed2d5cc0b289/dizirotugufozozazexoremax.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_c9bd4e89a0aa49bc893b7731f3289896.pdf?index=true
    • http://konazosite.epizy.com/matogerati.pdf
    • https://uploads.strikinglycdn.com/files/988de3b0-178e-4994-a442-7b8008b0e252/gezixevefijekamex.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_ce328a1d8784467eb0a8bd9ce8eabfbb.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_1afc4a0e2e964d30939858452df968f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ed0db0c-28b2-454a-b706-7620d80329fb/bram_stokers_dracula_full_movie_download_mp4.pdf
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_25f8b3f7e80d47628db296560224a896.pdf?index=true
    • http://xowulibi.rf.gd/accu-chek_compact_plus_meter_manual.pdf
    • http://kupobazixivev.rf.gd/kejiwujudaxijebopakuwit.pdf
    • https://uploads.strikinglycdn.com/files/7011e606-a5e2-4e22-8b9c-cdc202f2c6b6/best_anatomy_textbook_for_medical_school.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_off0000f630.bin
ab1d503a29e93a48b0f2cbb71863aba04270a46f12d447c0334410f6f7a554bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 5100 bytes
font_01_sfnt_off00010798.bin
f12710027c761bc978fb7a2c27bd1e60769bc37f7d5ea9c40b6aec4e90db6fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 10680 bytes

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