Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b5cd7dfb1a9b8c…

MALICIOUS

PDF

64.9 KB Created: 2020-11-13 09:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c6214a3a2bb10c78d003b4493e62a477 SHA-1: 30701b75d395d545d826db2e8678226c3b11dcae SHA-256: f4b5cd7dfb1a9b8c46ecb5c19a99c2389d159a230bc0d4de56d2eedab2a6f528
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for phishing. The file's purpose appears to be directing users to malicious infrastructure, likely for phishing or malware delivery.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=vidmate+old+version+2014+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f90371c820e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa2b6375774f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fa440e100f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5f9af4f3deb66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fa55f06bb4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f9a2b8fc4bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f9a51c4914c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fae16373dbf1.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/xabotidaxa-xapili-figobamatope.pdfIn PDF document text
    • https://tojetipa.weebly.com/uploads/1/3/4/2/134234581/ruroketakamof.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/gizonukorad/17958747310.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/hydroxatone_anti-aging_bb_cream_universal_shade_1.5_oz.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/depitivoxigonavunapewe.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_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 5544 bytes
SHA-256: 2d931f9cae8483f00a9b2669a57fd7efb7b65505882621e3149a7558afb4725f
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 10480 bytes
SHA-256: 5cb49e73d8bf841375b74a90c51b1ee66721737c67b271c174763cff38f617a2

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