Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cba7e50f9cfbcfb…

MALICIOUS

PDF

77.0 KB Created: 2021-03-03 14:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6d4ba9b6cba3c9e4a9e1ac2467fb112 SHA-1: 7a3da003a53d7f919a70796016c0faa0b007b31c SHA-256: 1cba7e50f9cfbcfbe07706fa5a3eba7b64ca144bde942d51c593082fe212b183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to seemingly benign documents, but one critical heuristic identified this as a 'PDF_SEO_LINK_FARM'. The primary malicious indicator is the external URI pointing to 'https://midufefew.ru/123?utm_term=brandy+alexander+with+ice+cream+and+kahlua', which is likely a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://midufefew.ru/123?utm_term=brandy+alexander+with+ice+cream+and+kahlua PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416654/normal_60286b9ab70d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_6021cd6c5343c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fea1b8d52ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_60328b9d4fc02.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/fihghie/dining_table_set_with_bench_ikea.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Mpjdy19/functional_abdominal_pain_and_irritable_bowel_syndrome.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/99fcd0ee19f.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/nufalopogufodasibuva.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/jirog-gikemavosilim-bipebufig.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://s3.amazonaws.com/polojuliragam/scert_kerala_ntse_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/38819124302.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/robert_putnam_bowling_alone.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/carry_on_jeeves_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/powerpoint_templates_for_kindergarten_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/30897030098.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/mamufotaliz.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5148 bytes
SHA-256: ad3db0ffe2f536567ef8a80d3eb070c932eda38c91a1b709dcabf49c6a2511b8
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10744 bytes
SHA-256: daf6a2b1813e757d4777e5f58e991d89c0790d967916136661baefde99788510
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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