Malicious PDF — malware analysis report

Static analysis result for SHA-256 1464f1bd2f008561…

MALICIOUS

PDF

74.0 KB Created: 2021-04-07 02:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b62b3b68ec59d45ad5f53f4a7a1ed2c1 SHA-1: 79788d3d99d58c64a4332aceff916f42318f5ccf SHA-256: 1464f1bd2f00856173ce8d877bfd9e798dbba053c2cafb202132763686d68b27
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=forgotten+realms+wiki+past+tense PDF link annotation
    • http://ig-verifiedsbadge.com/birdland_sheet_music34fsz.pdfIn PDF document text
    • http://volosaty100.xyz/pioneer_vsx_1122_ue22b71pc.pdfIn PDF document text
    • http://metazoaapc.fun/best_hill_country_road_tripmphqw.pdfIn PDF document text
    • http://korecos.ru/honeywell_360_surround_heater_wont_turn_oniajag.pdfIn PDF document text
    • http://getfreecreditreport.info/gisawosuzibudorosm1ub3.pdfIn PDF document text
    • http://goodsun.space/82569193645muxbu.pdfIn PDF document text
    • http://begdas.space/36369267739hio1k.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/segokog.pdfIn PDF document text
    • https://sifameduj.weebly.com/uploads/1/3/4/5/134522790/nitakukilubit.pdfIn PDF document text
    • http://feyakast.online/how_to_interview_for_a_nurse_manager_positiono8q96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_d3e5f11a8086439fa0cd30b937a8821f.pdf?index=trueIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_94298ea5a3b140189da0da2833ccf659.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_b31f073a6ec04f7bbf24da203f0b0ec1.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_71fe320f53f44ab087c335ef96a94c92.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_ae022d995c8744e09ad051700cd7e478.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_6abf7ecf99ad403eaaa5a3a03ccf40ef.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_b230aa979ec24f83a1c4467b6e54d122.pdf?index=trueIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_2b0fea8ef9744fe0b2150ab9ef2d11c1.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_60b7027ca396426a821ebd41d5abf461.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_9c2ed92dee1c492388a8e52ffa39df92.pdf?index=trueIn 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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 5248 bytes
SHA-256: 1bbc3785bf4be174220db7921186975fabde71ecf19a2bda43eb78f6de9a8a8c
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 11336 bytes
SHA-256: e0720f5a3bfdb4efd61e89bff70825d40068371687c707d3d521590fe3be463d