Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa490fe70fdf91e2…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 09:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb4fc33ba8921d792ca51024f39d7c8d SHA-1: 823702e4d7551c759158593bd7faf79d354182ea SHA-256: fa490fe70fdf91e2f5d0335182854ad6089f61952b9fd4055bd722115f45cb32
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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=how+to+describe+my+lover+in+one+word PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5ff0afde9ba8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ff27fd7dc391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_603d63818757d.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/ThbJibN/72680039190.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gejhChe/gejiminezawefimelux.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/jbibgia/rankerx_vs_seo_autopilot.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/is_engineering_in_high_demand.pdfIn PDF document text
    • http://xafomona.mypressonline.com/satowugazizaxuwunag.pdfIn PDF document text
    • http://itdiscount.pro/zudabr9pqu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_6038b9fe7a006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_601af6c0060b3.pdfIn PDF document text
    • http://usejus.pro/molecular_model_kit_instructionsbmr24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_171314ecd49e47cf961b208377e110b3.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_4d0d5a21cc594019b5fd52de1f6c5208.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/manual_de_taller_chevrolet_spark_gt_2012.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_42d799ffb7354a2e954254b66145bc13.pdf?index=trueIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_8c59366e1d224458a9735b0aa032455e.pdf?index=trueIn PDF document text
    • http://novupomajanox.atwebpages.com/second_and_third_conditional_mixed_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/wuges.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/regifexidezemidij.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/7410368658.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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 5232 bytes
SHA-256: 733b994c8db37636955e383fb8905dd91fdce15372c439d4f04baeb82e38191b
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 10864 bytes
SHA-256: 344cbaec82141f317f4a1b4aed312e130952b68e7a2dfaa1b383da5351c7da64

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