Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5ba8b76cab79fe…

MALICIOUS

PDF

69.2 KB Created: 2020-11-11 19:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 963504a998ca3ebc092986d9dc4f73b2 SHA-1: 2c5d112e253f63887611771c89fd6876df78cb7c SHA-256: 0f5ba8b76cab79fe2ae1ae44cc8415c8cb64a3b025e7301bc0cdf1f26acf0db1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or a method to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=graphing+input+output+tables+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8ba2c747814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8d1f22d92c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f8738f72cb43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_5fa456ffa76fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_5fa65fffa7056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f8f9e54077ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f9bb2632446e.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/sedumunotewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5fa82b80d1bb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e2b48c-19e6-43fb-ab0c-f300a499a85e/raketenuwodesik.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/lukubulunimikato.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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 5408 bytes
SHA-256: c0d4d30c6c3f631c6936079b37a19b279229cf9c9ed2ac9af713764b1e2cb1b1
font_01_sfnt_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 10016 bytes
SHA-256: 3153241b6cc3d9423b760d7bd09b8418d0f1037e4ab538206c273cb4d682ee8a
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16176 bytes
SHA-256: a83d11f783c1dece44620ff02a9368a27b843351725dae3c59ed79e93398966f

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