Malicious PDF — malware analysis report

Static analysis result for SHA-256 38110b0caad884c3…

MALICIOUS

PDF

62.4 KB Created: 2020-12-25 09:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5defbc0a95fff0ea8da52b2f6415b1d1 SHA-1: b45210bc3228ddb9c689745e85f61b52289ca07b SHA-256: 38110b0caad884c3c7f91d686fa290964a730333ac88792f9def983473e1457c
154 Risk Score

Malware Insights

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

The PDF file contains a link disguised as a cover letter template for university applications, which redirects to a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded link is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/aws?utm_term=cover+letter+template+for+university+application In PDF document text
    • https://cdn.sqhk.co/ludibipimilu/jdicWji/arduino_nano_v3_0_pinout.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/jhamhaZ/trivia_crack_2_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pepitaji/idYgggf/the_battle_cats_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/b5ghEic/fitbit_charge_3_bands_target.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/jakujakula/bufepute.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/44732569348.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/tony_bellamy_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/beyonce_single_ladies_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/ahlan_wa_sahlan_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/oak_creek_marching_knights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2612c07-4cce-46ac-9b7f-cc8a92df6cad/bulldog_mexicano_extinto.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/riwazepowisupede.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/168._excel_sheet_column_title.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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 5228 bytes
SHA-256: 6a38fedc72108180449a3af7a78f1866f6bf9a3a6dc6d12b4813b2ab6bb8ab09
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 9832 bytes
SHA-256: a6a82c40fff385fc9cac8f0d6ec4215fbddd4e8b18b1e24afedc3a29bc901862

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