Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e078d383f17a61…

MALICIOUS

PDF

78.2 KB Created: 2021-02-10 13:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e2ed2f6ea7bcfe0939579ba9c948ac1b SHA-1: 9c770887c824ba670693b331b714a2efff1e8409 SHA-256: a4e078d383f17a613870748013189229b27e813e42c0d05ec6594189b64f3210
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://yafferge.ru/123'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=propiedades+de+los+materiales In PDF document text
    • http://kinatoguvekajux.22web.org/mathematical_statistics_freund.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/49182064345.pdfIn PDF document text
    • http://nutapobo.iblogger.org/coldplay_scientist_piano_sheet_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/46090672364.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/xorelux.pdfIn PDF document text
    • http://nuwuzokapa.rf.gd/vezixuluvufafoni.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bise_sahiwal_supply_admission_form_2019.pdfIn PDF document text
    • http://bokonejedebi.rf.gd/candyland_game_piece_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/xojaxivisafevopape.pdfIn PDF document text
    • http://kinapemib.rf.gd/adobe_after_effects_software_android.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/xaninobutagiz.pdfIn PDF document text
    • http://dokebipozo.epizy.com/tagilirakeruludurin.pdfIn PDF document text
    • http://malinaliwul.epizy.com/the_dalaran_heist_mage_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/venarakugidoje.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/acca_f8_past_papers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/bokuwada.pdfIn PDF document text
    • http://wajiletum.epizy.com/mulujomazaxurup.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/27501626397.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_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5104 bytes
SHA-256: b4b9f126afb0d8ccb9096c8b887529162970985038723c7acb76209276c60f7f
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 11836 bytes
SHA-256: 317af685bf6b18e7bfb29333ba71960e3f8eba882fef58193180e393456968c2

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