Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd2a6d8dc63509…

MALICIOUS

PDF

96.3 KB Created: 2021-02-13 22:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f93fa5f900ff2dd84054b6e3a7bda20d SHA-1: d387f88cdef6225cf393d09a741e5105a8e050a7 SHA-256: 54fd2a6d8dc6350997ac4992273429f80cdb18226a46ddd547db23656c3927b1
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It functions as a link farm, containing numerous embedded URLs that point to various external PDF files hosted on disposable or potentially compromised domains. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=d%2526d+battle+maps In PDF document text
    • https://cdn.sqhk.co/vobevufubito/jNxhbii/86101691401.pdfIn PDF document text
    • https://xuravamu.weebly.com/uploads/1/3/2/7/132740838/ramed_nimobinevexe_luvog_lumuwesunu.pdfIn PDF document text
    • http://malurafokopumer.22web.org/formal_agents_of_social_control.pdfIn PDF document text
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/xuzuzaxumeravuwi.pdfIn PDF document text
    • http://jebewif.22web.org/banno_teri_akhiyan_song_mr_jatt.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/apsidEJ/island_wars_2_crack_download.pdfIn PDF document text
    • http://bujufamamaw.22web.org/nojobazarerana.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/YjbrDjh/clash_royale_legendary_cards_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/igWfigA/bitid.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/hhgcicZ/nezeno.pdfIn PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/fiberuvaba.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/23b5331b69.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/geATphh/sagazovuworamilovovesot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punozow.epizy.com/62234057933.pdfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off000161e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x161E2 6504 bytes
SHA-256: b05d02c61ea01b887f89ffee6a8a3c7da1c826af5b3e3bcae1cf332f790618e7
font_00_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 7516 bytes
SHA-256: 03de04004cdd807ea9c269500cd56b06efda50ff8db7b95da1d31ce30d174ec3
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 3148 bytes
SHA-256: b72324bf9fb2f960ad531a0c7fe13c100795e1c8b461db9e4f4d6c8496002b7d
font_02_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 4156 bytes
SHA-256: d9d9eb8b5a67a8494ca5a9593d54773c41ba913a17cb426b52e0a193c0b11448
font_03_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 6280 bytes
SHA-256: f19737e7ae504a93f2c40ebdcb093e324ed3d787609e781d4a33af58a066a9a7
font_04_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 15032 bytes
SHA-256: 759cf13fd26f2044dd777bbc9bb22d13fe1de4a1a77fe0b2f960fb89adbc9f63
font_05_sfnt_off00014b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B43 16516 bytes
SHA-256: cc4c4ec8ef66948cd3398a61336ca181b0064ec2239a21c36315eb1cf1e4a431

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