Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76f7f22773acf10…

MALICIOUS

PDF

66.8 KB Created: 2020-11-14 07:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a996a128244255fb418d38debbff4eea SHA-1: 8ea240fe6b36521d78e1dbef341cf08f642723df SHA-256: d76f7f22773acf10336841b52604a0a9ccb8fdb47510e895ff10edfe3aba7167
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF link farm detection and ML classification. It contains numerous external links, suggesting an attempt to redirect users to malicious websites or download further payloads. The presence of a download button lure further supports a phishing or scam-related attack pattern.

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
  • 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.
  • 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://trafficel.ru/aws?utm_term=bluestacks+mod+apk+ios PDF link annotation
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/2155160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_5fa5ec232d04e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f87320095ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f8ebea19c00a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5f95b88345297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5f9a3c3e14c5b.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/0ab7dd7982c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5f92326b5b5bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fa3f0315460d.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/tosasugokod/77522410452.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/saxon_math_course_3_cumulative_test_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb309fc2-808c-473b-9634-f1985016d87e/kopodanubusisolebe.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/trusting_god_day_by_day_365_daily_devotions_free.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_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 5236 bytes
SHA-256: c3dcdcf668fba3f6340b6cc54bc6f2892e1d027766a12a1775849162b3f17522
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10880 bytes
SHA-256: 2ea3f867f44dd09ec21fcdbcdbdbeaf77a5ec7a537893cdf62e084fa2de1d119

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