Malicious PDF — malware analysis report

Static analysis result for SHA-256 605d712a3f012b73…

MALICIOUS

PDF

67.9 KB Created: 2020-11-14 19:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 89a9a1b214ebbf80f3ccc1e2946961a6 SHA-1: 2d6043a77a5e5760e628f78a9978951d88ff25a3 SHA-256: 605d712a3f012b7388ca78d96f58bbda6dd5d8d52c2474fd6a2ab9392b8be6a9
214 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=l%2527+univers+est+un+hologramme+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_5fa8181cf0b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_5f98b02282eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8e24821fd3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f9dffc486377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fa3ac333c891.pdfIn PDF document text
    • https://benixufo.weebly.com/uploads/1/3/4/6/134660079/sarovaseti.pdfIn PDF document text
    • https://woxujinugav.weebly.com/uploads/1/3/4/3/134305359/didol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9c7bb28c5d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f998ab0d2a9e.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/wejuvono/musicians_institute_la.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/64452106868.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/jimuzawofi.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/wojugorijelibi.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/poregabatugowajovaveja.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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 5492 bytes
SHA-256: 217f617bf4aaa708b5ff94ffb4d74799e4c614caf8eee6eaa588f851e7f7945b
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 11848 bytes
SHA-256: 422592bd55897c000b2a72ccf77fb4fa62f286da8a649713a38dd2fb629862d6

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