Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28cc7310364bd54…

MALICIOUS

PDF

81.1 KB Created: 2021-02-21 15:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 164c08a1df78e520fb3945e2c1cbd85d SHA-1: d750b692a85a405d28eaeebc6804073245449e34 SHA-256: a28cc7310364bd544e3be8fcea82d28dc85acc22dcba05cc2f66fcc3f72325e5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing attempt. The embedded content, though heavily obfuscated, suggests a lure related to SAT scores. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely serving as a phishing document to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/123?utm_term=what+do+the+sat+scores+mean In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5fc790f05db91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5fdf18de89bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fd3dac15b2d3.pdfIn PDF document text
    • http://idslim-italia.site/31158231107c9see.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fe8e4b2bddd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_6007d1e391ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_602eff7219c48.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/padadutiseni/abs_workout_video_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/searchview_example_android.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/rikuxaxekozepujebe.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/baruvisoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/65037427010.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_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 5160 bytes
SHA-256: 8610bdd0ce07fb1ae00aff29ac9b2ea71e67e17ee5ec8ab02d5ac375dc5b6d38
font_01_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 10788 bytes
SHA-256: d3aa6c3079c3595d361627cd588dbb56cb9ea8a00258b43648ee5ac67004ad3c

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