Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b650975d48b76c6…

MALICIOUS

PDF

69.3 KB Created: 2020-11-17 13:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ae03d159750bd39e9162a2c9c8d50f4c SHA-1: 9861de8efb6cf5ad1ea28e5ec48d671c034c227e SHA-256: 1b650975d48b76c62e05cde6a3bf601f4daa5068a09fb39916c24cf265022c7c
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=alif+novel+complete+pdf+download PDF link annotation
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/soditu-bitaniwabolad-kisopelanofal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5f91460a1a9c0.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/8231468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5fa33888a9bc3.pdfIn PDF document text
    • https://jivoxafur.weebly.com/uploads/1/3/4/3/134382284/zirixofapivuf-fenepoxerorod-paretun-zumekapidumesu.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/6984134.pdfIn PDF document text
    • https://poxokisajape.weebly.com/uploads/1/3/4/5/134592502/1b0e2b.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/441866.pdfIn PDF document text
    • https://nifosigi.weebly.com/uploads/1/3/4/4/134488788/vopaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5fb362021471c.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/jofunozuzof/rejume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf6c377-6165-411c-b985-600f9efe7daf/seratakonafaxeneruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1182297-a1b6-42e0-8655-2b10c0c69299/10035828297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f7b7e4-1d95-4e8b-a0c0-724a022d1d4f/xumugojegidukadukukir.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_off0000bca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA1 5168 bytes
SHA-256: 990f55d0058cd93a5ee1d3b7b1f59ab07a8cf8187280555a20f678dbe771e0e1
font_01_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 9840 bytes
SHA-256: 119783e02ee86c87360c07dbe871c07e7f0c4ae5fa125ed8ffb1d2acdcd50333
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16892 bytes
SHA-256: f05816ffdd6afdc7818e009ef5e6da5b1d1019a44b0627923a4a57a5d1667f79

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