Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f9aa85ffb78b96…

MALICIOUS

PDF

69.6 KB Created: 2021-01-06 19:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c0cf9b7df8a70b2dff54c740161f7e35 SHA-1: 2ee7734beee59717be68e0806d05630d1cdf60ac SHA-256: 85f9aa85ffb78b96e4b7bc266dc7dee86ee6c4de47650ccc98863647a4befa97
212 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. It also features a link farm, suggesting an effort to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9501

Heuristics 4

  • 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.
  • 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://cctraff.ru/aws?utm_term=android+play+store++to+sd+card In PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5ff0d893f41c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fe9c1f4b7e04.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/zutabolom-neritevi-wapatokilab-nilelebatojo.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/tazopaju/92718340279.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/14966620069.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/tesokugegosiseguzafuno.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/free_urkund_plagiarism_software.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/logo_quiz_answers_level_4_logo_42.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97caa6d-7b10-443f-a230-3a73e1cfc4a5/69858310424.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/legends_of_aria_updated_taming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/vst_bandoneon_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/7775174027.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5160 bytes
SHA-256: a33579f4c5ff783be4302cd4cd9f2b4dc9ddbaa2bc8acd6e887fc2a10a86f2cf

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