Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf553840b230e01a…

MALICIOUS

PDF

72.7 KB Created: 2020-11-17 00:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dce76ba356bd4f10b18e40d5dadcf2a6 SHA-1: 088c334c95bc66316c8d44b7ad00c5b65133a866 SHA-256: bf553840b230e01ae7eca6669833fe3a2602b59e7280f68e8e179c142b989497
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://trafffe.ru/strik?utm_term=s%25C4%25B1n%25C4%25B1f+y%25C3%25B6netimi+test+sorular%25C4%25B1+ve+ceva PDF link annotation
    • https://poxaneduwi.weebly.com/uploads/1/3/4/2/134234601/e2e155.pdfIn PDF document text
    • https://jameropavide.weebly.com/uploads/1/3/4/6/134699307/d70b9.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/9628786.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/dozuga/oakley_caveat_brunette_polarized_sunglasses.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/548770012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee21565-0100-4ce5-9c27-ecb57cf777df/darovivogem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd281ae0-2c39-43fa-a72f-6424ebbd1a8f/97835176162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759fe6cc-11c4-4567-928c-c1e9e49c5e71/jenawub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf038677-61df-40a5-b320-e05993f3f5f7/nejugigirelaxobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c6b8fe-5424-4c88-bc0b-493af874a328/16030803458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bebef9-4ec5-448d-a639-4de306100994/27375034462.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 5460 bytes
SHA-256: ded5bbe513baa3753b9bd56db4d57dda5c38d23cfb19162a31d00146830613e8
font_01_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 10952 bytes
SHA-256: 5c2f9cf70c3237808a4cf04a3a9242eb94ed3af28f2b07a81effee5471c897e1

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