Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd87777e49607f93…

MALICIOUS

PDF

82.7 KB Created: 2021-03-23 15:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 683363a2ea6dbb3468cdff5f5fce3bcb SHA-1: 2bdf481ec6d684232dbbe39bd6c7c91f187281a7 SHA-256: fd87777e49607f9331d07d271286d5c4ac24755f5b04871a8eb5fdb86badd883
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, characteristic of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=historia+del+atletismo+en+el+peru+pdf
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/0d2a3fe.pdf
    • http://jopekeniwuvino.iblogger.org/27874654201.pdf
    • http://degujub.iblogger.org/esl_reading_worksheets_free.pdf
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/4308206.pdf
    • http://tobalalupuvobiv.iblogger.org/kgf_audio_songs_telugu_lo_ing.pdf
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/sukilupapugid.pdf
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/kesunowawilubupumo.pdf
    • http://nujerizura.iblogger.org/pathophysiology_of_carbon_monoxide_poisoning.pdf
    • https://cdn-cms.f-static.net/uploads/4450421/normal_60562d3113799.pdf
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/nimivefowif_jipilarepise.pdf
    • https://static.s123-cdn-static.com/uploads/4493201/normal_5ffe8a5ad6d44.pdf
    • http://womarerawona.iblogger.org/ac_market_apk_free_fire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_8d31e1764e4e4423aee7daccd78fab0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58c0284d-1d3a-410e-ba81-cb545804fb2a/speed_queen_washing_machine_parts_list.pdf
    • http://jevabatogi.rf.gd/ancient_egypt_a_social_history.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_69df7d1aae2647bc972d6ba8c6b2c4df.pdf?index=true
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_3dd9d5586c51485599c33da11ad8cd73.pdf?index=true
    • http://fafezevasuba.rf.gd/kexafaxinibibuzutis.pdf
    • https://uploads.strikinglycdn.com/files/ac46d849-b194-4bab-8af6-b59cfb1542b7/koroziwo.pdf
    • https://uploads.strikinglycdn.com/files/3cba2384-a3d2-4353-99e2-c4488d4851c5/59307976626.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_off00010238.bin
0f61db7de6d6fcbdd050a8640c57bd12c1220bbc7dcfb8c346c59b0e514e2414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 5148 bytes
font_01_sfnt_off0001139e.bin
4903acc0ad7fae675f5a3918a9b64b71fc4fabc5cbf3c2cdfc8392eb2520793f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 12532 bytes

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