Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ffa07ab44f70fb…

MALICIOUS

PDF

94.7 KB Created: 2021-02-27 10:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ecd15f494fad2de64961e1918089c082 SHA-1: 2fda48442bdbc6526fdb8d1fa68ade94969f3518 SHA-256: d3ffa07ab44f70fbba227e52f97716d254c75e2042ea676f30ae60fe6cf5353f
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://pelibifir.ru/123?utm_term=how+to+rig+live+bait+for+smallmouth+bass PDF link annotation
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/banela.pdfIn PDF document text
    • http://vehicleinsusa.com/53644744468qubl3.pdfIn PDF document text
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/vanebirulegirad.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/dafalusuvifefubuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_60051936b6172.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/8029971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_600b2d29b1109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_60071af83b8c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_602577600b282.pdfIn PDF document text
    • https://lefonoduri.weebly.com/uploads/1/3/5/3/135324857/kikonatu.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/gawenidavoxo.pdfIn PDF document text
    • https://bivitomelonex.weebly.com/uploads/1/3/4/4/134491730/manufuku.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/8424436.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/safebawifefog.pdfIn PDF document text
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/03817c02.pdfIn PDF document text
    • https://sexitikimuzulab.weebly.com/uploads/1/3/5/2/135296232/0ec008e967ddd6d.pdfIn PDF document text
    • https://tetejinuditobig.weebly.com/uploads/1/3/5/9/135973847/lalewigawin-zavadotusude.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/dunulipibefuzobodire.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/rogugagatuf/52183681962.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_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 5432 bytes
SHA-256: 80e5a619fc2a56e94e5280948827853e29930cc0e1c4ea9877988062fb8a666b
font_01_sfnt_off0001475b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475B 10660 bytes
SHA-256: 42cfbd7ead9c7558d2dd99c1d5fa4379a1dd9a67f8209879485edefeadb965c0

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