Malicious PDF — malware analysis report

Static analysis result for SHA-256 43401e9c4e886b0f…

MALICIOUS

PDF

82.3 KB Created: 2021-03-19 04:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99cfdad58d4b9e15bc523a86d29dea53 SHA-1: b89bdf1b3c7310da7e2985df4d0b3d17f5327675 SHA-256: 43401e9c4e886b0fcfe8cff86f4a7e665af72325db9dffa5c602f22bc4c9e787
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The document body, though heavily obfuscated, contains text related to 'ancient greek olympics info' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=ancient+greek+olympics+info
    • https://cdn.sqhk.co/feripamapuv/kZEnjjq/agent_orange_exposure_map_thailand.pdf
    • https://cdn.sqhk.co/sipebililofo/dhjoiaF/9870064833.pdf
    • https://cdn.sqhk.co/zasokolof/AzMHhcH/pineapple_pendant_gold_necklace.pdf
    • http://kixurox.getenjoyment.net/zhiyun_smooth_4_manual.pdf
    • https://cdn.sqhk.co/fomezawelud/ijjTiec/71410100465.pdf
    • https://cdn.sqhk.co/ripigopes/gjchiib/sugar_rush_3d_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/pisedij/farimimate.pdf
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_5547bac6c5074988a377bf06b2af6b34.pdf?index=true
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_459d007cef134eb8962fef6b44b40cba.pdf?index=true
    • https://s3.amazonaws.com/megodipewukitoj/dikuperixunulinev.pdf
    • http://futikuzita.onlinewebshop.net/how_to_start_working_out_at_the_gym_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/7005f3ad-cc72-4428-b9df-46f3c7c4283c/big_data_analysis_tools_open_source.pdf
    • https://uploads.strikinglycdn.com/files/c14576d0-4331-4542-8619-de4d97632798/fugurebugaroluw.pdf
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_44df4a3495b94fb0a969ad07d8bec240.pdf?index=true
    • https://s3.amazonaws.com/lezerawe/first_birthday_invitations_free_template.pdf
    • https://uploads.strikinglycdn.com/files/ac1e7980-2e8c-4505-b9d6-529f6063dd5f/how_can_you_describe_a_tree_dying.pdf
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_063641daf59e4cd8abda2d661fa50d93.pdf?index=true
    • https://s3.amazonaws.com/popisiburewixuj/android_outputstream_to_string.pdf
    • https://s3.amazonaws.com/xufaxoferugod/wukojezakigagow.pdf
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_f740c9fe47cb467e9301206250bcc157.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93d0f605-b833-4113-b7ea-22e01fe8cdd9/gipawufopomoloka.pdf
    • https://s3.amazonaws.com/tesotiwapax/13849198889.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e8.bin
cf9855eb05f60c42c8418c80f57acb6c8ca0c6bb43fa8557604202e37fbe4834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5280 bytes
font_01_sfnt_off000104d9.bin
b90269c5f3e368add005015fc82b7d9f2fd8d9cc0a75bf68cd374f423ae01bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 6544 bytes
font_02_sfnt_off00011634.bin
82c43bbc8944facfe6fdcc01b0b7932b389e43b28cd448345c805ad51a60c12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 10976 bytes

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