Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c49c40b8895b19b…

MALICIOUS

PDF

78.8 KB Created: 2021-02-23 14:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d426bdcce5288e818f1feebf3334044f SHA-1: e069daae17fb658e0d4a44f9dc0379f00f0f7c5d SHA-256: 2c49c40b8895b19b5e56236aa60adea7e558010d97e9ebe51fea46d6598c748e
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://jottigo.ru/strik?utm_term=examples+of+project+based+learning+activities+for+elementary+students PDF link annotation
    • https://bojijoda.weebly.com/uploads/1/3/5/3/135325587/gunukadiguv-mopudes-bamagum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6020b57632b3c.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/1757777.pdfIn PDF document text
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/fuzaluku-dakujupuvesavo-panexeninemopi-bafuwivaw.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/bujezibez.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/4a3db863e7.pdfIn PDF document text
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/56574.pdfIn PDF document text
    • https://xunijududivajol.weebly.com/uploads/1/3/0/9/130969830/a202e1a67f23fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_6007e1f3d0e18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fd67015b01ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5ff69241cf79d.pdfIn PDF document text
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/6442829.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/nimodifimizunoz.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/rowubunak/bojaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/hs_albsig_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/lorox.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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 5876 bytes
SHA-256: 9f1100ef77eee828c62c078bebe496589f0072757030f7b029af326970e64157
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 10108 bytes
SHA-256: 5a0e1dc7d144c10f54b7271ad550a779204fb7620350d813c3f607c06fbbc450

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