Malicious PDF — malware analysis report

Static analysis result for SHA-256 71af623f23bd8ffa…

MALICIOUS

PDF

67.4 KB Created: 2020-11-24 19:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 76021c94dcdf8b1e82413cda6e381721 SHA-1: 75b19ab640ce50284eb93d51be239597fa2ef722 SHA-256: 71af623f23bd8ffa4f560dc7307f320e0cb4e57a0586d91dc3168751c4b311ca
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a school directory. The presence of multiple PDF links and a critical ClamAV detection indicates a phishing or malware distribution attempt.

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://traffine.ru/strik?utm_term=quincy+high+school+directory In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f904d40e1450.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/9684552.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/2e1dc6ab-4702-43bb-8c3b-c62dda76eb5c/23898750049.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/91867797122.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/kizof.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/lords_mobile_apk_hack_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/apush_ch_12_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/download_kaspersky_with_activation_code_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/bonetown_para_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d46dcbb-9b9f-481a-abcf-2ea37ca3ccb9/questes_sobre_as_grandes_navegaes_1_ano.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_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 5156 bytes
SHA-256: a0ff4132ef4278410fa8e3fb7a60dd08da334dd6bfc8ac320b8d034a7ab0f11b
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 11440 bytes
SHA-256: f01d05eec128279267c65b118a0cbbe627cd34e5d5cf60d778a26e9e5b3a0e3b

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