Malicious PDF — malware analysis report

Static analysis result for SHA-256 97775556a189e62d…

MALICIOUS

PDF

75.2 KB Created: 2021-02-25 10:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a9d1ab3f2834c942544d5e8251cbeb19 SHA-1: c5b7e801e006ffd05bebed24a31470f14a36c612 SHA-256: 97775556a189e62d10c8fd5bf3e690765d91f046631d6234305f99553c1bd8ba
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 'https://crophysi.ru/123?utm_term=computer+architecture+and+organization+an+integrated+approach+reddit'. This indicates the document is designed to lure users to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to deliver a secondary payload or phish for credentials.

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/123?utm_term=computer+architecture+and+organization+an+integrated+approach+reddit In PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/rulilipusexanijase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376372/normal_5ff55c89486e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fd644ee3e3b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5fe3e0b74fec7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5febf1511c915.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/lovomijelun/jowopevolijesovugefo.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/dufejevun.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/capitaes_de_areia_baixar_em.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/suwuvazenarawusuluvi.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/xunipuvaxipevitut.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/how_to_prepare_for_a_home_kitchen_inspection.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/cerebrosidos_y_gangliosidos.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/pojofavofisila.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/taboxamumupitedebawita.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/uet_taxila_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/83135455461.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/teacher_contact_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/creative_writing_prompts_for_grade_4.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5232 bytes
SHA-256: c2a77b54aaed1a2449cefaed9ba0500e18a4587db9ea8f816d557ddcbbf5268d
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 11184 bytes
SHA-256: a77271cf7d24116eaa0ea3cb3bc43f62b37bc0d18d9ba33cfafa0f435efda803

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