Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff552dd18498700…

MALICIOUS

PDF

73.6 KB Created: 2020-11-23 22:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0f8a0c75c8b9be0a6adb9a10b8c6c358 SHA-1: 681677e4db2e778932955d3177b511cf951a1381 SHA-256: 4ff552dd184987004227b3bea09fdb3d902c9bb1ae0d46bfdd9b3a00b98e980d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one pointing to a suspicious URL that appears to be part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded links suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=nsx-40gt1+remote+control PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fb88a41ca4ec.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/1af10a9059532.pdfIn PDF document text
    • https://taguraridefukal.weebly.com/uploads/1/3/4/4/134446716/9a165e.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/4d4adf5e-2bce-4068-82bb-0cd62c083a7c/wasaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nolomuxuma/33817497032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add9221b-cbfc-431c-bc3e-754ecd9b266b/dsactivez_le_systme_dautoprotection_avast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c587dd-09ac-4b0a-8b7e-5e9318a78ce1/nonfiction_book_report_template_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/punctuation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc47cbc-0f20-4d78-b28e-db7c65b179fa/radiography_degree_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99afd6e3-39a4-4143-98bf-a3ac22831c0e/shanghai_travel_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/olympus_workspace_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ba50e6-902a-4f60-88f1-67268ecdcff7/nunubidiwariw.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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5260 bytes
SHA-256: cbfefce15195b0f7934e995ec622c7f76d67e6707ce2a963565b45e14843f0c5
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 10696 bytes
SHA-256: 1df946e41312e90198296e2c51c4383f4f048979271fb8a8519bbc959d0d310a

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