Malicious PDF — malware analysis report

Static analysis result for SHA-256 238a4910a19307aa…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 05:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76b715938a1ee3d0056c6b7d93c777bb SHA-1: 9ea3aa0d3b88d71af689af7d85a66661dee9f025 SHA-256: 238a4910a19307aa5588192531335dc505490aeec92959715d30d0fafcc7151e
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=premier+protein+chocolate+shake+sam%2527s+club PDF link annotation
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/jupevi.pdfIn PDF document text
    • http://simultaneously.space/rebirisi5ksf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5ffbb2a2543e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402936/normal_5feeaf16c13a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_600d587699bad.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/xoriromij04coa.pdfIn PDF document text
    • http://gravkamen.ru/the_norton_anthology_of_american_literature_9th_edition_publisherxanjg.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/9527919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_600ce3bc3c5db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5fd2b0dc935d9.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/2734090.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/8080382.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/biwaxu_petotu_ruvejiletajaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6034c1b56bc9a.pdfIn PDF document text
    • https://bubunixijasebed.weebly.com/uploads/1/3/1/4/131407035/240e5d51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fc955efd511d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimizisunope.epizy.com/jedakoparemi.pdfIn PDF document text
    • http://davagutuvis.rf.gd/54390273466.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_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 5412 bytes
SHA-256: 39de7cdc75d7121f11d87b2b674a2946ec17d77ae92383c80037395743705dae
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10548 bytes
SHA-256: e6f34e54edbebab2c689061de706aa5ea078a42f1d11e83b61f0f03faead16f1

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