Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dff1eb42b3b160d…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 04:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1d0981ddfe602ef96a8e7a264ca3ddc3 SHA-1: 0e74362547f96a2280ac24df59dc380c40607507 SHA-256: 9dff1eb42b3b160d8e0c3a24614bc8820a9301f079ca2ace5fa2b50cd69e8d56
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". One prominent URL, https://mezovuduw.ru/strik?utm_term=romeo+juliet+songs+download, is directly linked to the lure text. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the SEO link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=romeo+juliet+songs+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60352ffad12b2.pdfIn PDF document text
    • http://gisibumovemuv.22web.org/scalp_acupuncture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_6020b89ac72ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5fed179f91377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be877a93-2f64-4e7c-8cc1-06004da91b8e/zavunigukef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86f1303-5408-4fc5-8f1e-2f98524b979c/25059102318.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/xusew.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/2505570280.pdfIn PDF document text
    • http://vuropomap.epizy.com/obat_analgesik.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/b._com_4th_sem_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/can_you_feel_the_sunshine_lyrics_sonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2381856-94bb-4a91-b007-5d4ae1911221/the_breadwinner_novel_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/regulatory_reporting_jobs_birmingham.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/50360105564.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/pinebopikomi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/dovasagozoxubapikupika.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/coldplay_viva_la_vida_trumpet_sheet_music.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_855b7aabf4e34d8f9abb1d6e3af61d45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/questions_with_auxiliary_verbs_exercises.pdfIn PDF document text
    • http://sisukedazigi.epizy.com/videoshow_video_editor_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4cf0fd-5da6-4310-9a57-646030ec219c/18882359378.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_6bb9f6b9397145519ca54963ae86edfb.pdf?index=trueIn PDF document text
    • http://lokuvutifinulef.rf.gd/hundreds_chart_blank_printable.pdfIn PDF document text
    • http://tofixadik.rf.gd/bawavukemakokupaju.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_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 5224 bytes
SHA-256: 311eb8a04e50b4ea510145c408497ed1d45e33fe777ad774db7a7e8bf82d484e
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 10776 bytes
SHA-256: 223553da834a5e8693e49e3e9df149e59b75235afdb730bc540eacb5f159c275

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