Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d1dc00a46962e7…

MALICIOUS

PDF

86.1 KB Created: 2021-04-18 01:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb181c1e7e329cd5d2f3d44bfe24e0fc SHA-1: 9afb05e5d4e4cb76813cac50315435181e161cb7 SHA-256: b9d1dc00a46962e7e26d0bcb65b1df6b8910b0cbe8d2c316b547bc9c51158785
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=stand+out+from+the+crowd+meaning+in+tamil PDF link annotation
    • https://cdn.sqhk.co/tiwopaperuv/gdhalhc/reset_sprint_drive_password.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/jZheODO/mcc_parkour_map_download_mcpe.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/nitajetalim-waxatifajivovak-tafuno-munemu.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/hcgBjhd/amazon_ultimate_wish_list_catalog.pdfIn PDF document text
    • https://kizuzeno.weebly.com/uploads/1/3/5/3/135326612/7184662.pdfIn PDF document text
    • http://1xbet-regi.site/murubesorafanamijebadada0jq7x.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/hgUhjC0/slot_car_trainer_program.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/f5idujc/akasam_thana_song_free.pdfIn PDF document text
    • http://magazinrf.xyz/786806368440xyrv.pdfIn PDF document text
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/d3f92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_6625fa5c59b6401292784817b95f77b1.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_667efddfebad4b188cd88061959acf14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/banuso_by_brymo.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_ca84b8134de74a1cac5ae72cb337a4b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/bhola_song_2019_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/bilitedofumemutud.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/mack_e7_460_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/magobuponumiso.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_370567200b664cfdad60fd7e62cf9be2.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_7b4f382b6109499b9cdf82fb5fb856f3.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_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 5452 bytes
SHA-256: 826e02e32c691cb5edb07f20757e8153fb3fac939616d0d44aebca80d17c795c
font_01_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 10972 bytes
SHA-256: 0d7ad7b5a0069edf83eb38b9cd0bf3d6f06186209a3fc641c3392163ff7afaa5

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