Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84465162baf275f…

MALICIOUS

PDF

69.4 KB Created: 2020-12-18 18:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7a0cec01b8af9ffbb60d1cfe644125b6 SHA-1: 05f511d882b871131b431b84400445608976843f SHA-256: f84465162baf275ff56df0386911aad09b835c8a5732d4449cbcb2e6f0110d38
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggraff.ru, which is indicative of phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Grendel chapter 5 study guide answers'. The ML classifier and ClamAV detection strongly support a malicious classification. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?utm_term=grendel+chapter+5+study+guide+answers In PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/6721608.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/993904.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/fuvedunum_gatokun.pdfIn PDF document text
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/gakisuz.pdfIn PDF document text
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/mizezuguveroka.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/a4937d144.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/70ad6c08-1e49-4821-bd0a-7a941f6b7b31/no_manches_frida_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c87788c99b6d37a67a80/t/5fc1a4294f983757201d96f5/1606525994689/nepevoxugipepirimojimapu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d900d26ff1194f736c6f/t/5fc6aadc145a8629dc9d8c70/1606855398550/lusatutetugoga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 5456 bytes
SHA-256: ef2ff0070bef925419e259f0f5ffbe11b5407495ba8a4823d35e1191646493dd
font_01_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 10140 bytes
SHA-256: 534710646fdaf0c0e6629e6fe92c70e530fedbc380e1e30fe6e40297ef5e66d9
font_02_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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