Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f41b274622cd097…

MALICIOUS

PDF

74.5 KB Created: 2021-04-20 14:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d701e764ce43bde3f6ad394e2fa27bd SHA-1: e21b72e13ae583e011c5c7fc047f59096c59c65a SHA-256: 9f41b274622cd097d71895b5e049faa6ca85db21ca05421e0c0fdb09041b075a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of an embedded URL and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://maypoin.ru/strik?utm_term=ain%2527t+ia+woman+bell+hooks
    • https://static.s123-cdn-static.com/uploads/4488556/normal_5fff98770dd80.pdf
    • https://cdn-cms.f-static.net/uploads/4389820/normal_600edcb1ca78b.pdf
    • http://zatutajijiti.getenjoyment.net/bedikat_chametz.pdf
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/mujaf-tawugozev-doguzoxodawar.pdf
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/rodirokafuzopofo.pdf
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/c26381a38.pdf
    • http://betijeduw.getenjoyment.net/adobe_acrobat_pro_dc_accessibility_guide_creating_accessible_forms.pdf
    • http://sifimomikev.sportsontheweb.net/5th_symphony_piano.pdf
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/079755732b47.pdf
    • https://feredelulewijun.weebly.com/uploads/1/3/2/6/132681536/2225438.pdf
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/pujemufiziloguf-fejudufan.pdf
    • http://gemofesane.medianewsonline.com/64137901042.pdf
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/d18eb8e.pdf
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff03f334b36e.pdf
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/6322662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_84365746d1f54299be5231bf89057be0.pdf?index=true
    • https://s3.amazonaws.com/lanaladu/amado_mio_sheet_music.pdf
    • https://s3.amazonaws.com/widofafane/harry_potter_lego_2021_books.pdf
    • http://farudigenudoze.onlinewebshop.net/zasedalo.pdf
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_ac66884151bc4264ad08dc1396831104.pdf?index=true
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_e0238df165ec47b58f1b37e0f0062d14.pdf?index=true
    • https://s3.amazonaws.com/jawusawar/rekodopixejamigikamif.pdf
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_7adf7e9c017046859699acbf490219df.pdf?index=true
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_713b05772b6d47839494dc633cbab426.pdf?index=true
    • https://s3.amazonaws.com/vifusupegiza/12570783311.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_off0000e542.bin
0b2b3c17ad47b6c0532f4e2733c2d7019701d177e9aa7325a57f00237336f46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 5148 bytes
font_01_sfnt_off0000f6b2.bin
ca392cd3b4d849023f9c7202a1a42b4a6c35bbdd1a102bbb375ed5af5ef8ac47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10404 bytes

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