Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e62b0fce443c54…

MALICIOUS

PDF

83.1 KB Created: 2021-02-14 13:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf58bb5ffd827157e739df214330d7f2 SHA-1: 1c50585e4549f450943624b6e64580297e049759 SHA-256: c7e62b0fce443c54662b03e11ca5dcf60c2aa80a811486bfc1ac68f739235cb1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('maypoin.ru') that is likely part of a link farm designed to redirect users. The presence of external URIs and the link farm heuristic suggest an attempt to direct users to malicious content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/123?utm_term=california+lyrics+yungblud PDF link annotation
    • http://xipevufizokev.iblogger.org/42997442543.pdfIn PDF document text
    • http://najefot.22web.org/android_review_smartphone.pdfIn PDF document text
    • http://gedoviduge.iblogger.org/lulum.pdfIn PDF document text
    • http://rotepojisox.iblogger.org/core_java_written_exam_questions_and_answers.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/bofake/29886522793.pdfIn PDF document text
    • http://pamajaxa.epizy.com/sasifevidujugog.pdfIn PDF document text
    • http://fiviwuzovalexop.rf.gd/4688913427.pdfIn PDF document text
    • http://nabapuxamiluj.epizy.com/checkout_page_template_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/maple_leaf_rag_sheet_music_easy_free.pdfIn PDF document text
    • http://kutijizon.epizy.com/76468090574.pdfIn PDF document text
    • http://gutolagewu.rf.gd/vometaparodanefusil.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/sixakewilebediwekotiwa.pdfIn PDF document text
    • http://pakemeza.epizy.com/acetal_spec_sheet.pdfIn PDF document text
    • http://gedikoti.epizy.com/avast_free_standalone_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/88053627293.pdfIn PDF document text
    • http://paporoj.rf.gd/brittain_academy_test_section_5_answers.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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 5336 bytes
SHA-256: 3c99b21c32c8b057545551820eef8b72d8f73951f2916fd7b4e1de49119cd258
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 17144 bytes
SHA-256: 8e0258d7eb42437e3ad12757d0b3e9721f07f091b7567dad5a54907b2a7141f6

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