Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc668bf1c4aa0f2…

MALICIOUS

PDF

86.8 KB Created: 2021-05-27 09:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d7e98d07c0b5dd158607c2a29b903ad3 SHA-1: 0a84c6c434d427d6744c825356f992704f444335 SHA-256: 0cc668bf1c4aa0f2a5420460966a7bed0821ba4c4354f25614ed1ff21caf2fa1
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed for SEO manipulation or phishing. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=zombie+frontier+3+mod+apk+download+android+1', which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=zombie+frontier+3+mod+apk+download+android+1 PDF link annotation
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/saduwepubuzu.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/vanirojuwebewamiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401994/normal_5fd04d33d3887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_60074f5246d6e.pdfIn PDF document text
    • https://xiworibamenu.weebly.com/uploads/1/3/4/7/134728691/5549319.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/nugolegolemet.pdfIn PDF document text
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/paruwivejagipor.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/majesarabetipik.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/wulodule_jidovukererol_jifefenamurukej_josebode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6f3b4fbe-0003-4ce8-8880-8cb1deab6d42/zorigetavuxomekusasemiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f093c6-252f-474d-8662-ab6381fabd75/kenmore_freezer_model_253_temperature_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6869a5-6ce7-48b3-aaaa-b015d3d6b710/print_your_own_birthday_cards_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db288734-6031-453a-8ee7-b321195247ad/90504497524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3272f0f3-5d34-4d1d-8689-6f893f56bb5f/how_to_geothermal_heat_pumps_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de317ce-2d2c-4f2f-8a4b-4bc31f8442bf/what_is_an_isekai_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4ecf0f-1bbf-4ed2-912c-08b245c68d06/64362217188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277234e9-a931-4773-b1b9-13a80bd47220/tabiperadafifitako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8a8a9e-fdd4-46c6-8ffe-80f27dfb0cf2/49328684968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe86d89d-1fe7-440b-8e6e-44c0c0a769fd/wiwisarumofowixoxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b343b12-813d-409f-ab84-d4a07a6af13b/unlock_bootloader_huawei_p9_lite_fastboot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116211ce-d340-4eb2-a09c-fa0eb2f0bf01/45563220350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e016b854-f6db-46f2-bbba-927b532f0708/twilight_4_full_movie_in_hindi_download_480p_filmywap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 5268 bytes
SHA-256: 1e2ce83fb168f719de5ca998da96d8a73619262435d3987d912d3abb392cfd2f
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 11576 bytes
SHA-256: ba8f4740f782cf05384ef876891422475dfd4582252cd5db0a9511ec2a67cc11
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 16376 bytes
SHA-256: e87520b30f327a8a5323ab93b8cce4d075987e8753d8028e4b2f002fd883682a
font_03_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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