Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f1c565d059760c…

MALICIOUS

PDF

154.4 KB Created: 2021-02-18 23:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1b751de548652f20cee0c9f4ce7d293 SHA-1: 45ed0910335c10b3730c6afd570f045dd770ecd2 SHA-256: 39f1c565d059760ce6b6211f4b6c409d9799f815ebb168621bcde9fad9819d6b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose, which is likely to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=el+aleph+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_60272e2c1d087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_6016edf2ddca7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_5fe240932b184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_5fe97334d6fcc.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/gdigbhb/41387948805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_60297a023dbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_60233a226b13a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ffec07ad70a8.pdfIn PDF document text
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/7106753.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/menidonepod.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/5m6gjja/ball_drop_arcade_game_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/VaFGQjj/bbc_sports_football_live_scores_africa.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/guvekos-pozosi-resaleto-fosanoxorowol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5fdb076ae3919.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/dutine.pdfIn PDF document text
    • http://meletemobu.iblogger.org/jopemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/basic_of_inorganic_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/40095929879.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/wanted_bhojpuri_video_hd_song.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E45 5120 bytes
SHA-256: 7867b120b770e5a518637592a880caafb7cb1a48e98be6883a6efa03f8b8b448
font_01_sfnt_off00021f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F8A 11824 bytes
SHA-256: 2a0d7440fe745be13952797f7c08025166669bff3d28966a15673f1a2f5b9044
font_02_sfnt_off000246fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246FD 16060 bytes
SHA-256: 2cca29575edef7a9880cf400a7847cc5df22ba1ee7edc19c7b9bafe603f6c979

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