Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c81e23e1e9bcf1c…

MALICIOUS

PDF

84.6 KB Created: 2021-02-22 06:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f87206f3d0f5b6d8bc6e2ad21d4cf5c3 SHA-1: 8a6c74f8973aff953e9dbb85f2ac7b6c737f1168 SHA-256: 2c81e23e1e9bcf1c583b6149710da6a7c9dd872b22bdc407ca519ce16d66db6c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, but the presence of malicious links is a clear indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=cu%25C3%25A1ntos+m%25C3%25BAsculos+tiene+el+cuerpo+humano+wikipedia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_6020408e28ad7.pdfIn PDF document text
    • http://pagebake.com/freshwater_angelfish_care_guideb0k6y.pdfIn PDF document text
    • http://rotelebi.22web.org/engineering_design_process_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fe930738021a.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/RUgjjja/veviv.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/jjdhdvd/snappers_key_largo_mile_marker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_600c4b7c557c8.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/fpojiWf/85658408715.pdfIn PDF document text
    • http://simagasavopajet.iblogger.org/72432704755.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/sitozi/bopuzuletekewaj.pdfIn PDF document text
    • http://vijixekezej.rf.gd/pl_sql_oracle_tutorial.pdfIn PDF document text
    • http://sirevonigira.epizy.com/egyptian_cotton_bed_sheets_john_lewis.pdfIn PDF document text
    • http://gebetipuraxos.rf.gd/8220319455.pdfIn PDF document text
    • http://tudefoka.epizy.com/wow_legion_legendary_fishing_pole_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/2114751537.pdfIn PDF document text
    • http://wotanuxofewaru.rf.gd/how_to_write_a_report_in_the_laboratory.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/mulerekotazajomaxexu.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/31749602740.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/lethal_fetal_akinesia_deformation_sequence.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_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 5724 bytes
SHA-256: 8cd48b0d70f4cdc0ede77ce9a2591b06342f34e75b75b7b7f43590ec083f3a8b
font_01_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 12216 bytes
SHA-256: 2fc46bd8cbc87c296153280b5af0edf87b9affe81ed2b6adec6ace85a63d3e22

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