Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1cd58f2ac59b72…

MALICIOUS

PDF

95.3 KB Created: 2021-03-15 12:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062dae4b2a21b7f827a8935822b63218 SHA-1: 69bd3cf90791036cd097c07f8a031ff85196a5ba SHA-256: af1cd58f2ac59b72d24b90978914187ecde74410ed0d32f6e013b685c81938b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The document contains numerous external URLs, suggesting it is designed to redirect users to malicious sites. The presence of embedded URLs and the ML classifier's high confidence further support a malicious intent, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=best+raid+defense+team+empires+and+puzzles
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/2929611.pdf
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/fabowubavasilu_pesedimivonajub_xuzuga_vatexukigi.pdf
    • http://naturalik.fun/jewawijubujceoyf.pdf
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/kifipijofanixelosi.pdf
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/802988318.pdf
    • https://jovavogi.weebly.com/uploads/1/3/4/5/134597399/tedijege_petul_lotefogitipir_pezuf.pdf
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/5158862.pdf
    • http://pumba.fun/76654566138gm3ur.pdf
    • http://1gusevshop.space/char-broil_grills_deluxe_digital_electric_smoker_7256rkp1.pdf
    • https://niresofet.weebly.com/uploads/1/3/2/6/132682193/livowimigerozo-pirugu.pdf
    • http://ig-verifiedsbadge.com/xabibou8hdn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tarizirefevifab/finikabibuzukom.pdf
    • https://uploads.strikinglycdn.com/files/6a6d5479-f3a4-4e1f-add9-eb622aa9f8b0/76686855294.pdf
    • https://uploads.strikinglycdn.com/files/9a1fabd6-3b6c-4ae1-80f2-7efedd63572b/baldurs_gate_2_portrait_generator.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_5a470b7f107f44b98cc744136a141183.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_b8d113d036eb477ca7d04a7a72ded9f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4cff5aa4-9025-49d2-807f-479c88722381/varulufevamowekofukiru.pdf
    • https://uploads.strikinglycdn.com/files/8dd6163e-5a8e-49f5-9ce3-f35d823369b3/how_do_i_descale_a_keurig_2.0_coffee_maker.pdf
    • https://s3.amazonaws.com/venunamazozuzo/nitekavazogadevebifadazur.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_df8e8e1e7fc24e8595cc238f9478ef88.pdf?index=true
    • https://s3.amazonaws.com/dixaleko/corel_videostudio_pro_x10_templates.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_off000134ae.bin
b09ad31965fb34816aed520ccec0b1dbb55080bfbc422e4b4fa05cb84dfeb386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 5284 bytes
font_01_sfnt_off0001469c.bin
584438071d5b4ac264f9d5c90a56f3551d81c90a97923fbc852bee854e9ecbe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1469C 12040 bytes

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