Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29dfb7638e19dc4…

MALICIOUS

PDF

73.1 KB Created: 2021-02-18 00:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b0c9cbe1225c3377239601ee4d49b791 SHA-1: 6c53a37d9ef06d9a57abf3398a4403dc89fa30d3 SHA-256: c29dfb7638e19dc4341a4f81f0d1c185f44fbf4adb3d57f10f62bbb8cc445ca2
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple embedded URLs and a heuristic firing for a malicious redirector link, indicating it is designed to lead users to malicious infrastructure. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest it likely exploits PDF vulnerabilities or uses JavaScript to initiate a download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=reckless+racing+3+apk In PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/8325609.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/bepelosuva.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/lidisixuxedav.pdfIn PDF document text
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/nosusumupipuwuvud.pdfIn PDF document text
    • https://gonelato.weebly.com/uploads/1/3/6/0/136082396/waliresagilurixodir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fce16af4c0b9.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/tolewezisusu.pdfIn PDF document text
    • http://xikumidevulofo.iblogger.org/rolling_action_items_list_template_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370057/normal_5fc93afc76d30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelilurezo.epizy.com/land_rover_discovery_sport_2017_owners_manual.pdfIn PDF document text
    • http://vafipisepofowo.epizy.com/badowonoxavizo.pdfIn PDF document text
    • http://debukigezi.epizy.com/67609993803.pdfIn PDF document text
    • http://wojudor.epizy.com/vifajemojudad.pdfIn PDF document text
    • http://pagujuropiwadiv.rf.gd/musuzagi.pdfIn PDF document text
    • http://zarevamemamafo.rf.gd/vejefevivedufilekif.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_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 4788 bytes
SHA-256: 1f9aa6230a0012dce29fd85aba0f47f4e3f6f0249b7f75c71bb378d813326844
font_01_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 5336 bytes
SHA-256: d0cf4e747ea36d52550719e93484a1ee82271ba3095062fa04795029d51b552d
font_02_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10360 bytes
SHA-256: d536cb75f35b1c688477b0d2dc74e71048e8299be20bb287a008102f0f671136

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