Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd78cd56f02b5011…

MALICIOUS

PDF

80.9 KB Created: 2021-04-16 18:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d48952cecc0fdee98adbb570ee26d7b SHA-1: d9389d3a7f3e5d09b7f46055b03bb461169c8836 SHA-256: fd78cd56f02b5011ddb0d27ccd336bf476bf143cd68c7724ecbb5794d4faab28
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bologen.ru/strik?utm_term=what+is+ragnarok+in+viking+mythology PDF link annotation
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/nokasefib.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/mamopatujew.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/Xahdjhz/checklist_example_excel.pdfIn PDF document text
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/jetomazuvemesup-xalewubo.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/venaboliw.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hbHhiid/22168263471.pdfIn PDF document text
    • https://reralifinopu.weebly.com/uploads/1/3/4/0/134018386/xomepiwitij.pdfIn PDF document text
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/wowezo.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/bifrontismo_tasso.pdfIn PDF document text
    • http://folejaf.mypressonline.com/31777072992.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/law_dictionary_arabic_english.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/strength_of_materials_book_by_singer.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/4242077.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/ih8zsgf/identity_v_joseph_new_skin.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/9215278.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/ifijEKH/regaragafejobutowojujilu.pdfIn PDF document text
    • https://gegawega.weebly.com/uploads/1/3/0/7/130739786/4222234.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/rC1SJgc/lenovo_smart_clock.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_5961d911364443dbba463191dcc65868.pdf?index=trueIn PDF document text
    • http://ralirajuz.atwebpages.com/suvefugopunapadunabiruva.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_f278ca9b3f9d442cb3d4bb42c2453921.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_9fcb3c2a41284a92a7a788a8eb32a65b.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_056faa6485b4460ba2247ca97659b1d8.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_f07398fa88574b4a8574f9093fdc2ec0.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_0b738d6f439842d09439b89e9fb01ce6.pdf?index=trueIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_f122cd4933394045b786451a4340e85d.pdf?index=trueIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_4a8e2250f4284063a769805edbcb755e.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 5340 bytes
SHA-256: 18fb7430da1f4bd6d064e2c7ea22a4ac26daaa872d7add2f9f89baf7bf4a95dc
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 11196 bytes
SHA-256: 0e112b772e5cab777c09b7dc19e85755b3050453d3abf1c1ff04000a31698ec1