Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8ed709ac03d624…

MALICIOUS

PDF

68.8 KB Created: 2021-03-10 21:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38ba1618f381bde256a9481fa28a058d SHA-1: e6b3c51ca993c1380d5b50cac0b8a361097a7c66 SHA-256: 3c8ed709ac03d624e8215cf5658cc6dc342a09d2bd9302c049390ede24fc38c2
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://xajibur.ru/strik?utm_term=nespresso+pixie+user+guide PDF link annotation
    • http://burasiwe.22web.org/creative_cloud_desktop_app_for_windows.pdfIn PDF document text
    • http://beststudent.space/pokebaxelizorobajijiwawawru9y1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_6010cc7c065e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601c91cdb5ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_602d9f01b0e73.pdfIn PDF document text
    • http://roskycnmx.com/rebilurizipihq5v.pdfIn PDF document text
    • http://tikovg.xyz/immanuel_kant_philosophy_of_self_summarys0865.pdfIn PDF document text
    • https://muwemobivom.weebly.com/uploads/1/3/0/7/130776082/4838867.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/rabuxifivetukini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_601ae13fa9300.pdfIn PDF document text
    • https://wigufigavotafo.weebly.com/uploads/1/3/1/4/131452860/4899dd49f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_11bb2436aa6b4cb78b70335f174e77e2.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_c9ec59ab403e41fa9ac31c80b1fdd60e.pdf?index=trueIn PDF document text
    • http://gasukexopesifu.epizy.com/56012462645.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/age_of_empires_castle_siege_trucos_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/iphone_6_plus_how_to_use_apple_pay.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/corporate_social_responsibility_issues_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/46845270531.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/49695097720.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/why_is_samsung_tablet_not_turning_on.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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 4924 bytes
SHA-256: 5c23ec6b90eb408703deee441244b322738636c1d6bfb46d51bc1ca5f87f521b
font_01_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 10308 bytes
SHA-256: eba26a0edbc5c467df94dec915572c9562174d97a189f06edee58db124554739

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