Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d191163d5a1c5c…

MALICIOUS

PDF

73.2 KB Created: 2021-02-13 18:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 83d0ed761cbda0cc4af34ab4586598c2 SHA-1: 8910ae866619a1e3da14d385b7cac845023be1b5 SHA-256: f8d191163d5a1c5c6c082660c90bdd7fae26f7df9d4157734c59af82832d02f2
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The embedded URL, https://yafferge.ru/123?utm_term=inequality+worksheet+pdf, is the primary indicator of malicious intent, likely leading to a phishing or malware download site. No scripts were extracted, but the PDF structure and URL strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=inequality+worksheet+pdf In PDF document text
    • https://cdn.sqhk.co/letijefa/1ijMZHY/edge_lighting_samsung_a50s_tidak_berfungsi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_6004fb11af0b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5fcedeb4527e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_600cc1fa2e744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_600e5d55f218d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476443/normal_60017f3a076d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_6017882b99b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5fcea4ab9ad24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_60103c8cacfc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_60196007594d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5fd1d5a27bc05.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/hdhiigc/18720227982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fc8bd48e16df.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/jaKkgcS/62476520584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_60112845431d5.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/pobixedele/tikamivinifelagenopok.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/carcinoma_do_colon.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/addition_of_polynomials_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/pathophysiology_of_heart_disease_7th_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5452 bytes
SHA-256: fba7a62474b2e20693ea401dd534babad1374bfccdbcfc604b429c06e8c1956a
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10072 bytes
SHA-256: 14208a92d361235be8530ae65ddaa6bcfd4dd1cd82275ad2b742a69ec33068ce

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