Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a58271590e73e4…

MALICIOUS

PDF

59.2 KB Created: 2020-12-23 04:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6b9ceb49105ee2471b60daa79d8b23b3 SHA-1: b53a102dfaaed07fade49ec1b1866458cba1de7c SHA-256: d7a58271590e73e428e9d1a07402afe77dd8ef48e68a7006c274990d0809a7c7
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong intent to lure users to external, potentially malicious, sites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's part of a phishing or malware distribution campaign.

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
  • 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://traffmen.ru/strik?utm_term=olvidarte+como+lyrics+in+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f96311d3b682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5fb4479dc15e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f9f8345e982a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fcbbe816ed01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fa2befa26b48.pdfIn PDF document text
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/8ffbca7.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/2ca4dcb14d4f0ff.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/jonora/gokefegozonevaforome.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/2019_acura_rdx_performance_0-_60.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/tiger_census_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2fcc31-9c4a-4b40-83a5-103546a23331/37431520960.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_off0000ace0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE0 5540 bytes
SHA-256: e580197e342492b01cee41ed6ecb24b0908d9b954445948a8bf271ec25e3f14d
font_01_sfnt_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 9672 bytes
SHA-256: f75b092db742709d9e6523d69e125508729874e335d998f0517c345214ab9497

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