Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a098d886227d48…

MALICIOUS

PDF

69.1 KB Created: 2020-11-09 19:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cffb1cb4c38cd9d7b61b2af6c260c737 SHA-1: d94673f14f7bfec6af171d2a0412821ae7da7fee SHA-256: a1a098d886227d480e94d645b8b223a5f947ed6d631f9debd2c7f8abd023dc40
204 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains a link farm and instructs the user to disable security software, indicating an attempt to facilitate further malicious activity. The presence of embedded URLs suggests it may download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?keyword=monkey+city+hacked+unlimited+money PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f8bfa7218dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f937a7280a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f954177d9f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_5fa86d105405b.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/5062423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f8b2aab89483.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/taturi/32602403810.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/tomorrowland_2020_belgium_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/responding_to_cease_and_desist_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1f53cb-224e-4709-b328-c19682f1713a/tidinoridoxemubipixokiro.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/honeywell_thermostat_manual_rth5160d1003_u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecdf396-d5dd-4c16-bebd-c09db09ba458/xawaxetunubobafig.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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 5076 bytes
SHA-256: ad4ae6ed127c72d4b79b5e7518c65ca313611e24455ee05f3ec3646564ca0723
font_01_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 11124 bytes
SHA-256: ece57bb96effb135c59ca83394d81325572c66e30c72e0f3b69278f787cc12a5

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