Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a75390f1db22006…

MALICIOUS

PDF

76.6 KB Created: 2021-05-25 08:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 35458af5959a30d1e5207d7313d3b779 SHA-1: 87f61376b3f61716ea01cf9013a65a868263c146 SHA-256: 3a75390f1db22006f98565601413ab13ea1914b7c149be3a6b69255fa8769dfc
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://druttle.ru/strik?utm_term=internet+explorer+12+64+bit+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413011/normal_601f158cb96f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_601e6188cb95c.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/430e83525ae9b.pdfIn PDF document text
    • https://jigudisite.weebly.com/uploads/1/3/4/6/134603970/vemofateset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_606924b8edb6d.pdfIn PDF document text
    • https://rufuwoja.weebly.com/uploads/1/3/4/7/134735928/xojotovafibavuw.pdfIn PDF document text
    • https://kifadinegek.weebly.com/uploads/1/3/1/4/131407901/pekesemo_tanizid_dazuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_605f8ad34f0d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_6029677639f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fe506d65c340.pdfIn PDF document text
    • https://dokosoberodato.weebly.com/uploads/1/3/4/5/134597138/1008902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_606c3cc3df4fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_6006fe22d4342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_5fdc7aaa922c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_601fef1b8bf74.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/risod_goliw.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/bojafazes/guvarebi.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/sql_server_2017_express_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/when_was_the_us_involved_in_ww2.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/arcgis_10._6_free.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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 5548 bytes
SHA-256: f51bc85b32bd3efe82eeef73db997b6dd32d38a8d5c40c0146d48a9ccc574c24
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 20928 bytes
SHA-256: a151856b2cb3e8038d3f549ce327c974fed20b9394ead65ca021963ab5a2c621

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