Malicious PDF — malware analysis report

Static analysis result for SHA-256 638aac58ea58db3f…

MALICIOUS

PDF

71.5 KB Created: 2021-01-21 02:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ed49c0fa853428cd174abcfd56d47666 SHA-1: f9b0c1313d192344d5c46e546e1c558d0e282bc7 SHA-256: 638aac58ea58db3ff269daaa8715abc5cfa4dbbee5a50c7875a3bd2bb56a3b46
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The embedded URL is designed to appear as a search result for 'The walking dead season 1 episode 2 walkthrough', likely to trick the user into clicking it. While no scripts were explicitly extracted, the PDF structure and the malicious link strongly suggest it's a phishing or malware delivery attempt.

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://crophysi.ru/wb?keyword=the%20walking%20dead%20season%201%20episode%202%20walkthrough In PDF document text
    • https://cdn.sqhk.co/jisaside/hfWihFo/new_fifa_laws_of_the_game_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/cBkhiC5/69644729310.pdfIn PDF document text
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/pagofejez.pdfIn PDF document text
    • http://pusolaxunu.66ghz.com/irregular_menstrual_bleeding_treatment_nice_guidelines.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/50829ba5161.pdfIn PDF document text
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/xaxix-wudepug-zejibobu.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/jf0CrGO/rajukas.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/xiije23/kivivuwobowogufaneze.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/dorulusof/latest_android_version_for_samsung_note_9.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/15535778456.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/pajosawelig.pdfIn PDF document text
    • http://sijeregezokim.rf.gd/92478885260.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/red_dress_for_semi_formal_wedding.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/87262332336.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/mitexobitidedarelujuliger.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 5512 bytes
SHA-256: ca6c9ea4acf2841bab79a9835b0e268956cf744da14e7fac6a70d49906ebb0bb
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10180 bytes
SHA-256: 5d91e73f982730372be4f0cb521b8f29ba37e5ec112c13f7776e616f3ada9103

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