Malicious PDF — malware analysis report

Static analysis result for SHA-256 220797bacd7184bc…

MALICIOUS

PDF

69.2 KB Created: 2021-02-14 03:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a1814f0f81a626159578144076238cb SHA-1: 671e5fbf56ddc36b58d6b55d2e7d38af3dd9e495 SHA-256: 220797bacd7184bc7d53d87d02f874ed0555725f51bcb93d01def56c64622107
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the nature of the embedded links suggests a redirection mechanism to a malicious site, likely to facilitate phishing or malware delivery.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/aws?utm_term=at+command+tester In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412183/normal_60021fe90cf5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_602706924c3a8.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/jomemuji.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/podew.pdfIn PDF document text
    • http://auto-agents.space/zavapefolopumeti6iuci.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/898186.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/4f7407c1c3e4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_6000dde3c2834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd0a0f749fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_600d43d10acf5.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/petubapizo/96734492894.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/tofazezega.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/factory_reset_samsung_s7_android_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/nupavopir.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/fridge_freezer_temperature_log_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/46041458764.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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 5044 bytes
SHA-256: 26200184c79ed8a04760619a7a0a65358697d2e627879753c15ccb40304b3852
font_01_sfnt_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 11160 bytes
SHA-256: 15e793f2218720dffa7d90b6d78f2c65da6fe226dd69acc592dad55c7c5f8d8a

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