Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee482699ea3811f…

MALICIOUS

PDF

67.9 KB Created: 2020-12-05 07:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: adffad15102d0797a9a8a28018239c76 SHA-1: d2b3724af3cc5a9fd24ebac3223f8171d33fba8b SHA-256: 5ee482699ea3811f56c115f00f7fce0989d1480294b40874c1051d333bfc0e59
186 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 6

  • 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.
  • 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://trafficel.ru/123?utm_term=lauren+hutton+pharmacist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5fae0cd9968c5.pdfIn PDF document text
    • https://pegebitejujag.weebly.com/uploads/1/3/4/4/134445458/707be.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/9260569.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/6215693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5f8faa47311ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f87f1e5cf66c.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/bbe0bb4ea72a.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/ziranu-vituwasapubadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5f90ae232a411.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/goxip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/niporofez/no_call_no_show_explanation_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/18615208638.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/puxanen.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/microsoft_word_vocabulary_term.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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 5080 bytes
SHA-256: 14f6cde787e0a43abb317d5e772dfd13d0ebe46689a9fbd395d2757d0d10c2ab
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 10980 bytes
SHA-256: d25250cc9685c92174413f1153cd4a3267d0e7a48267280073824aef3aceb512

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