Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631e14c8138958b…

MALICIOUS

PDF

71.6 KB Created: 2020-12-17 23:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 77a57023121cbc8f6ba392ea56fc89c1 SHA-1: e0eb56159eb432ee5f4408c2bc90e882091369a3 SHA-256: 6631e14c8138958bf1c3d0e8baf8334f5c4e30fbfbc798ccbb7cc3973241c810
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a PDF redirector link to 'traffmen.ru'. The ML classifier strongly flagged this PDF, and ClamAV detected it as 'Pdf.Phishing.Trojan'. Although no scripts were extracted, the embedded URLs and the nature of the heuristics suggest this document is designed to lead users to malicious infrastructure, likely for phishing or to download further payloads.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/strik?utm_term=dna+replication+webquest In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5fa2383e1c27e.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/4439956.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/wuledemipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_5fa63e9c61724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bb01ae5b-5079-4d12-8c64-e49f8d2095d6/totatumuxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f20329b-2168-46ec-bb7d-2c46692342b9/31984561659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d8eca2-4cc3-4e23-9d26-9d37255f617a/watch_online_blu-ray_download_dc_com.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/dawobuxegukaterogujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e212141e-5244-43ef-8c57-c007efd736e7/xujufefor.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/chowka_kannada_full_movie_3gp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28afa5e0-bc91-4078-8c7f-a9acae72622f/loxosivovenakikuvasajezi.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/vepev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bb9815-9980-4497-940e-f23399ba42c0/steps_in_conducting_improvement_curve_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/samsung_cell_phone_manuals_j8.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_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 5168 bytes
SHA-256: 7301452588025d51f2a3e09e01764110af43cf6f234fe5a9fc8fe8818a44f9da
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 10496 bytes
SHA-256: 9af179018aef3fb5f66d837f49167c1ba71243549b91954e2c88003b1b29d696
font_02_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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