Malicious PDF — malware analysis report

Static analysis result for SHA-256 a489c233ed5fafe2…

MALICIOUS

PDF

62.6 KB Created: 2020-11-22 19:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9d7643eff5f48e307d7737f83ed1995 SHA-1: 18f7c93d219940d3ca3cb15609be4765f14f1ce5 SHA-256: a489c233ed5fafe247522d5bfcff06b22e2fc076418566bbf8acaa6ee6bb473f
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://trafftec.ru/aws?utm_term=sh+phonics+worksheets PDF link annotation
    • https://jakidanumamew.weebly.com/uploads/1/3/4/8/134881834/xevijokaf-wuwiriri.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/dubesiguk.pdfIn PDF document text
    • https://xogupugisi.weebly.com/uploads/1/3/4/1/134109029/9983496.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/9be944c92ce7d.pdfIn PDF document text
    • https://jimitorivav.weebly.com/uploads/1/3/4/8/134878901/7601839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fa9c29bb785c.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/sopakefipesi.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/e8319100-d32f-47b3-b217-33b281f299ea/japik.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/ankle_sprain_physiotherapy_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5ae160-fb5f-4005-adb3-f8f0f4c70b6f/77251331943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c1f3c3-3131-4f56-818e-78e5c6fc00fa/3547526509.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/encouraging_words_that_start_with_letter_i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfda9618-7712-4f19-80e9-83a9e9034ac0/19198079313.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_off0000b878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 5036 bytes
SHA-256: 27189dd5920d57ab24258282349a8be35d678dd7dccea8e73eae58c6aa0e23cc
font_01_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 10636 bytes
SHA-256: b54eb385ec6f3134893bd5c2d0332c0211ed5b5c118ae54d73709e10657c137f

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