Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fac67c86d90f7e…

MALICIOUS

PDF

73.9 KB Created: 2021-02-19 12:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 27e40ec10d74895530b7e6895a3d9331 SHA-1: e57bb4336ba07e43f5394b9c24543b5632567ccd SHA-256: 65fac67c86d90f7e30af68a5dc68d0d7edd4a70dc1ee3e2f3c04ccc331668811
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier, with critical heuristics indicating it functions as a redirector to known malicious infrastructure. The embedded URL `https://crophysi.ru/wix?keyword=antonio+de+rosa+rate+my+professor` is the primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and the presence of numerous embedded URLs suggest an attempt to lure the user to a malicious site, likely for phishing or further malware delivery.

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/wix?keyword=antonio+de+rosa+rate+my+professor In PDF document text
    • https://cdn.sqhk.co/lojenozasila/uvieihL/gambino_slots_free_vegas_casino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fe4d4a51e899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486522/normal_602b27bba868f.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/aSGidjg/kevewimurolefugupe.pdfIn PDF document text
    • http://donuliwobem.iblogger.org/31011541518.pdfIn PDF document text
    • http://rorasilozaput.22web.org/fomik.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/jfIA3pL/86676219733.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/0iWjijf/vitamin_d3_vs_d_supplement.pdfIn PDF document text
    • http://galoomer.online/what_is_research_methodology_according_to_different_authors175h3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5fffd3b57e998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_6006bc327117c.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
    • http://tekefugenira.epizy.com/nice_guidelines_delirium_in_elderly.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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 5036 bytes
SHA-256: 5268cd4688e89f0b0e8295c9b2f454c5a6b8b89ee23ce70d38ca269b4c707f47
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10240 bytes
SHA-256: e3cf1e9fe49e821fa19638b00274c5a9a852b074d4014cc65ae03eabb6276309
font_02_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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