Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b56ae7662782db…

MALICIOUS

PDF

71.6 KB Created: 2021-01-23 05:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ca77f98cb235ff7dee7572cd9b66aab5 SHA-1: b7badae0a994f15a7b4ae73d118355ea9080e734 SHA-256: 59b56ae7662782db17ca960a390243835d1f1dcace69dcc9128dedf4ec4cbad7
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, yafferge.ru, which is disguised as a vacation rental agreement. This suggests a phishing attempt to redirect users to a malicious site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=vacation+rental+agreement+vrbo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fe936a69289a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc72870e2aa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_6005122e6d8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fe52e464f2ba.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/goveruduzewoxu/78862182610.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/railway_reservation_form_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/8990997048.pdfIn PDF document text
    • http://sivakekixil.epizy.com/internet_calling_app_android_studio.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/demifamizonevuzeluduz.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/electron_configuration_practice_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/thimbleweed_park_apk_and_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/pewuloparinusav.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 5108 bytes
SHA-256: ab23f75b420ccc4ee7fb307b33821de807c1880e1e89c9551bb53e855eef152e
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 11164 bytes
SHA-256: 19fb02302a50fd0cbae8c62945be5bb3d348d002446eaf734c375bff4399a655

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