Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ecaeaf83dd3a2b…

MALICIOUS

PDF

78.0 KB Created: 2020-11-14 06:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 982e6283128a5254761385bb4131326f SHA-1: d49335abc5d3a06ab3a945a1522a1f5b7f545fda SHA-256: 49ecaeaf83dd3a2bb8f92cae78d43ad1f7a2e4485425fea44a90663132cdfc0a
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 0.9997

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://trafffe.ru/aws?utm_term=bissectrice+d%2527+un+angle+pdf PDF link annotation
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/dofopo.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/4107587.pdfIn PDF document text
    • https://xevejepagog.weebly.com/uploads/1/3/4/6/134688444/8709807.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/49b396ef5a14f7.pdfIn PDF document text
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/7bce69eb.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/petujeme-befefasu-bijov.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/libuxuwumun_nedevof_lozarus_werajozefugulek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5faa7bcc46cb0.pdfIn PDF document text
    • https://dovogejeromew.weebly.com/uploads/1/3/4/6/134666082/sekolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f8f8b719fea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5f94a1de4dd8c.pdfIn PDF document text
    • https://safikevobajegev.weebly.com/uploads/1/3/4/3/134352312/lalanuzij-jopabitiwotudu-mokopozaramakid-gutinifa.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/b7819f60-b6eb-4696-98ad-13c1f5249b0c/jazawefe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 5408 bytes
SHA-256: 66b584df04c94aeb60cf0b05ff298623daded0c704cd760915614a3e8149b832
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 11340 bytes
SHA-256: b135c9bc962d6774aa70c50ea2f3dc331621c60d5053a1cf6d078e315dd6ed9e
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 16076 bytes
SHA-256: 26ddd33c86de12c045729a51efb3d8435ba1515195a17a4aec020af2bb0c010d

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