Malicious PDF — malware analysis report

Static analysis result for SHA-256 a540e3c8bda2e085…

MALICIOUS

PDF

76.6 KB Created: 2021-04-04 06:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 994b4f8c943eb076c7a7e52686510e2d SHA-1: 6e483d80ba138710cf0b2d67e3b687efca33c5c4 SHA-256: a540e3c8bda2e085f4ed6943406998355b849ab3c8b550d4e57d8a40c92992c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://baarspo.ru/strik?utm_term=diary+of+a+wimpy+kid+movie
    • http://lozebakumod.22web.org/vertex_of_parabola_worksheet.pdf
    • http://kmikaerfs.ru/48522397153jl2i1.pdf
    • http://filfex.ru/algebra_worksheets_grade_7advxq.pdf
    • http://apsdd54gfv.xyz/fimovujafebotopudo472l3.pdf
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/4dfe4b83e0eb7.pdf
    • https://rejezulibege.weebly.com/uploads/1/3/4/0/134018585/79054.pdf
    • http://pokemonrivals.online/escape_game_50_rooms_2_level_133uyr4.pdf
    • http://m-laskin.ru/first_words_book_the_works0n8w0.pdf
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/selavaluligewixolabo.pdf
    • http://itfamily.pro/bunadujovakejumiwegalufuj6v.pdf
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/a07fdcc4af77d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/697fe466-2526-40f8-aa49-713f82a66ea4/30500913668.pdf
    • https://uploads.strikinglycdn.com/files/c7ef1d0b-33d0-4a07-9870-33f9fe396f40/muraponapixevagaxakofe.pdf
    • https://uploads.strikinglycdn.com/files/48737b43-512d-4045-bd11-b64849105768/24077874369.pdf
    • http://molitumulejoji.rf.gd/games_2020_pc_download.pdf
    • https://uploads.strikinglycdn.com/files/b57169c1-43f0-4fe4-a135-2a31ba2d9bfd/best_free_android_apps_for_learning_arabic.pdf
    • http://givaxolek.epizy.com/what_is_the_best_monsterverse_movie.pdf
    • http://mopufeva.epizy.com/guvawidexosin.pdf
    • https://uploads.strikinglycdn.com/files/e9c9d1d3-7524-4bb5-add4-e27f7010d65e/42799986476.pdf
    • http://zafurug.epizy.com/king_platform_bed_with_storage_ikea.pdf
    • http://jagofebasej.epizy.com/bajarisepobexapovasok.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_off0000ef6e.bin
1b7cc41f47e0ae4a6f53484b3ae7068602f3897edd10346233279a9b5d11a530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5296 bytes
font_01_sfnt_off00010189.bin
0c7a07836117de7b4284ca83c0b0aebb2e2615201b25a21b15b57b8fb31db751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 10448 bytes

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