Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9772967361ff11…

MALICIOUS

PDF

74.5 KB Created: 2021-03-01 16:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbb7d1491b05c26922f202eef3b8823d SHA-1: 5acfc57e027042aa1b33b01275d0f47abe06bff0 SHA-256: 9e9772967361ff11ae32fc4f5e932f48970f0599da0134c9c057c7a5744c09e2
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on domains with unknown or suspicious reputations. This behavior is indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=multiplying+and+dividing+rational+numbers+worksheet+algebra+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_600b202ddacdc.pdfIn PDF document text
    • http://digtalcaliper09.xyz/21046948992xr7qc.pdfIn PDF document text
    • http://copyright-helps-team.com/lofenozidunifimi59xhl.pdfIn PDF document text
    • http://straponartist.com/36848608792ogld4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5ffa2aa429b43.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/dapesigatomiwate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_601245dd6fa14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fd273b45b102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fd13140e1f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_6003bc37ecc27.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/vekexusuxat.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/82e3504.pdfIn PDF document text
    • http://50offshop.info/mild_intermittent_asthma_guidelines5pegf.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/gimufesajo/buderus_logamax_gb172i_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/gantt_chart_template_construction_projects.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 5968 bytes
SHA-256: aaf846da4685a35c86cabef0a8cab7116f5ab697750dc5559addaa3487d2e9a1
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 10708 bytes
SHA-256: f193d2638fb03727a5a10ec78cf2f95566181c9c4da1358d0048f0c330fc1f9e
font_02_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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