Malicious PDF — malware analysis report

Static analysis result for SHA-256 df91af0b54158e79…

MALICIOUS

PDF

73.3 KB Created: 2021-04-17 18:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 875ca7154e58cf48ec108d821ed6da92 SHA-1: d443a91ee89a15111276059d80453ec51d800d6b SHA-256: df91af0b54158e79d435175d62d5dd50b92a7cc613bfb849a73ec2f9e58fb9ab
156 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 5

  • 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.
  • 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://bologen.ru/strik?utm_term=how+to+connect+epson+stylus+sx438w+to+wifi PDF link annotation
    • https://cdn.sqhk.co/lisakopew/hjZjhjd/91950825441.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/c43MJhb/science_lesson_plan_template_nz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb8c94714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5fc8b1918f2dd.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/xoguxe_podaxawodej_rafufuj.pdfIn PDF document text
    • https://cdn.sqhk.co/libibamudo/3DytLie/video_klip_i_like_me_better.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/gowupuzokowuxes/lolukajetumipajupudetini.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_4e2704d7852446d28c99ac588e5254b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/jomos.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_1ad1aeb22c0e4a2e94cd1f7baa80bdf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/93575082245.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/95137008194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858a8642-780d-4e08-896b-e58dc56cad54/lavur.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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 5372 bytes
SHA-256: f715e985c05591eb7329195b5560b0308f630350adabade903e12c4a7f9cc5d8
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10504 bytes
SHA-256: 5ae0dc1b587b58960d2282f8b88e39eb7bac32ea53dbb6cece747e98233b1028

Open this report in the interactive analyzer, or submit your own file for analysis.