Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1bacb56c14883e…

MALICIOUS

PDF

64.4 KB Created: 2020-12-22 02:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cbe163313a1799636ba9e745ef9a63e0 SHA-1: 51188653f2eaa69c8743ef0b1d6ad1a77708aba3 SHA-256: 5f1bacb56c14883eb1f68236576565e0defb78ca9064f3fb093ad305d0fccc06
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external websites, including a known malicious redirector and a link farm. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though garbled, suggests a lure related to medication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/aws?utm_term=cetirizine+10mg+patient+information+leaflet In PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/zonadakumamopuwawuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f8c02442b146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_5fa3e4e6d056d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_5fbd7cd073893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5fb621e561125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8919ff426cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454301/normal_5fc6ad0c2b37b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5faae58a6c0b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcec57fdd72e923764758e5/t/5fd221c5a9eaf43bd85d21d2/1607606726775/67675152490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0606b18f-81c9-4f29-841c-f9fe4333ba87/kexolegadizalikusa.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_off0000c0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AD 5192 bytes
SHA-256: 05708b36a21457f9119ef298be6cbae9482d3ea9c38fd18461b2e5856c4943aa
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 10140 bytes
SHA-256: 224d1f0666a8d4aef3ac2520788515f7c4c4cfe25b92082f731eb5b0337acfed

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