Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3de3f842b6058a3…

MALICIOUS

PDF

77.5 KB Created: 2020-11-14 11:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 64ecab30792755678de814443d2e6ca1 SHA-1: d4eded0f5aa5ffdbf9eacb5825e50c271b6973ae SHA-256: d3de3f842b6058a3b784ef02a37ece0fae1096a36caebecb8757273b2882a19e
164 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 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.
  • 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://traffset.ru/strik?utm_term=kumon+answer+book+level+f+math+pdf PDF link annotation
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/wunatu.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/dd1c8f83-b5ff-4fcc-b734-0481fc547fb1/62689717205.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/4804267693.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/84041043066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef1ada9-6617-492a-aea9-6e25168a645c/65718070590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4423ce3b-a546-4b2c-95af-7f0f972af578/75858431921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052c85dd-f01b-4271-8f7d-790953e5a0af/jidakomakumufulaso.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/zaxum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c43e36-1bf0-48c5-b8dd-3c5ce7429067/77521800796.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/bomibozolovotebeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ad0284-c171-4fc3-912c-45fbd8166ec1/zewobarusemakefavid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aceac15-56ff-46a5-8a34-02809d945dfe/65243482426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af26bda-c2cb-4f40-8efa-ec7a2cacd165/glencoe_mcgraw_hill_new_york_geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/segip.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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 5604 bytes
SHA-256: 02d3489051646d0a063d0c9ff1c48a0cbc097f640eb1106ba38e7e6b0d72de9a
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 12444 bytes
SHA-256: cbda8aab509d5feec018aadb20f7b1ce253965d6e43f03a8aff249412010c2b5

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