Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4795ae2cc0abe9…

MALICIOUS

PDF

78.4 KB Created: 2020-11-22 19:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 47cc9e3e5eb6a9333a358472617e36b7 SHA-1: 95ac1831806d36c22dc1a192bf217d07fb8fbe3f SHA-256: aa4795ae2cc0abe9364a8d5d4c59ab0f35b305e1edf7c75d4ce26db1f1fec1a3
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 0.9996

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://traffnew.ru/123?utm_term=alchemia+story+guide+job PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5f99ea3d25232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f8ff93039522.pdfIn PDF document text
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/1189487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f920211515f0.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/bikikanafopavu/fejuvatoruvajujudegafixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b50d89e-9055-4dc1-a8f1-a2805745a533/nizakufifarelebixojozozi.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/83209968382.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/oster_dehydrator_fpstdh0101_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/geometry_dash_noclip_download_apk_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/navy_start_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/revow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4695117-e77f-4611-ab32-db0acb2c08c8/likezakikaduva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91537a53-3057-46d1-a706-6a28cd048b29/97455681805.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/88114670692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdf7588-0c06-4797-809e-8d01765695d7/roful.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 5660 bytes
SHA-256: d1cdd791d289307f038778de18394a714edaafedebfa7a6afc5a336e9a7588d0
font_02_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 11176 bytes
SHA-256: f4593b992b5c961c65474c979595a621a97beb79f34a05c781fb22631ee3b512
font_03_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 16376 bytes
SHA-256: 737830b2803f14706015c1ae5dca05440698897ae4f3f8a1b69d224149914af8

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