Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edfa1b087cc2f42…

MALICIOUS

PDF

66.0 KB Created: 2020-11-16 18:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9a280131c1f2529cd30618f4185af314 SHA-1: 2f95b58e4940abe049945ddc431647678cc3d401 SHA-256: 8edfa1b087cc2f422bf3513dfcf27869c3051110c64b20e7108f5d4c45a10a14
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 0.9998

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://trafffe.ru/strik?utm_term=normalizacion+de+la+violence+definic PDF link annotation
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/78837abf1e77576.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/5209017.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/9559360.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/zafunat.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/dekefomivupe-kovak-talajonipa-fedebiraroz.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/26572113-1887-40dc-b751-574df5f88abd/zinokoreru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f964a4-821a-4b99-b309-e42bf53fabac/tirefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f830e93d-bc2c-4808-958e-91d725a9697d/somalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eefd13a-0391-443b-b04b-9860df40b791/81211482732.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/binusuxib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46df4d9b-3027-4ad1-ba17-50544f16a972/zagizaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8c57c9-b550-4453-b5b7-02a4d394c2b0/19029547154.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_off0000c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 5068 bytes
SHA-256: 2e9922a4f52f664098e83b403befe7fdde6149bff83699737c8e524d9eb94047
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 10836 bytes
SHA-256: 60b014b447adfd92f4b5485409d97e383a3dc8eca9af120ab8a17fbc288c9aca

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