Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d728a04d9888ad0…

MALICIOUS

PDF

81.5 KB Created: 2020-12-05 02:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cafeba4a2674aec10eac1bd2065f4daa SHA-1: 236dab24978a916393db5d50e2c784a099a4a78c SHA-256: 8d728a04d9888ad0d0c0c83baedd3092b84017fccf1f8d8021c8385bdc9c23c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://traffset.ru/123?utm_term=sting+ten+summoner%2527s+tales+vinyl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422147/normal_5f9f9f93766ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5f90785fad5ca.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/jinebagotuzeko_gokat_dagopisukufik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fc21f5e111b0.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/5136552.pdfIn PDF document text
    • https://romagazep.weebly.com/uploads/1/3/4/7/134759296/1d16ff828c.pdfIn PDF document text
    • https://xegejibizagufom.weebly.com/uploads/1/3/4/8/134851168/685698.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/wavunot/cbet_exam_secrets_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f45e4a7-48ce-4467-99db-be06c5c6017a/lekilutatogilufu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/bpd_in_ultrasound_report.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/reviews_tatcha_primer.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/79633497045.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/dikuged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e80f63a-edda-4823-b859-99914644312a/calendar_template_2019_2020_printable_free.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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 5188 bytes
SHA-256: 1d2e8150db28856fcc57029f0785ac835c99d6f666d7fc3141491a334d3153f1
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11128 bytes
SHA-256: da6e12fc95c61692a91b4d5c7d675053b06889e368198ff3645b66d8a73b5260
font_02_sfnt_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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