Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8487e608e77f567…

MALICIOUS

PDF

140.9 KB Created: 2021-02-18 22:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be4577ded537a87646569e88bef8e0a4 SHA-1: 7269e473134f2bfcfe4391cdadbd169a734f87f8 SHA-256: f8487e608e77f5671df3f51369dfb11a449c6600a2b190d7b7b1d7ad349540cd
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=does+judge+judy+pay+the+settlements PDF link annotation
    • http://gutemelav.22web.org/xejirujim.pdfIn PDF document text
    • http://roralukomoko.22web.org/audifonos_bluetooth_bose_tws-_5_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/gghg7jp/best_forex_trading_learning_app.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/muvalamotu.pdfIn PDF document text
    • http://idem-peshkom.ru/pibetegohrc4.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/7854581.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/lhankgk/46491293408.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/ogjThcO/photo_editor_software_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_6022152e8ab8c.pdfIn PDF document text
    • http://gerawat.22web.org/oracle_msca_user_guide_r12.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/python_2._7._16_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/iagjt5q/dank_snapchat_lens.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/LugeRVC/download_magic_cube_puzzle_3d_rubik.pdfIn PDF document text
    • http://mepuner.iblogger.org/eclipse_jee_neon_64_bit.pdfIn PDF document text
    • http://gratoraama.website/lagu_the_chainsmokers_new_song_20174so2u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozirumine.epizy.com/in_vitro_diagnostics_market_report.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/avast_antivirus_full_file.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/70503022337.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB96 5456 bytes
SHA-256: 8e66e5b92dfa16005c66f6ec9d575eb5ad3f136bdf3ed3b6ac768d0394390135
font_01_sfnt_off0001fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE15 11716 bytes
SHA-256: bff0dac61e72ad3f4e4499c0f58d2cab742f5c1821ef4cdf0196a35af097c452

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