Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9922c07e970e60…

MALICIOUS

PDF

59.9 KB Created: 2020-12-09 20:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dd0ee62d56b95925c85b56b96154bf1f SHA-1: 193e1125a6cc36843335d96087bc5fef33d81fa8 SHA-256: 1d9922c07e970e60ed38c3aa8d27e362c49a4fce56e3e087ac038b40fb1684a8
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'chapter 3 cells and tissues answers'. The presence of multiple external PDF links, including one to a redirector, indicates a likely attempt to distribute further malicious content or phish users. No scripts were extracted, but the heuristic firings strongly suggest malicious intent.

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://traffking.ru/strik?utm_term=chapter+3+cells+and+tissues+answers In PDF document text
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/vujap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_5fc0387db3955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fd07b07de939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fa62ded48020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5faf08a7c3d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_5faee5bfa253e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_5f964182f0f11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fc6c38b5f40c.pdfIn PDF document text
    • https://welarozukakiwa.weebly.com/uploads/1/3/4/4/134497755/jipurijoni_silapiveteruko_libekidafuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f9841a2a71a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fa22283cefec.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/pesetufavo/break_even_point_chart_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877c3457-fb69-4545-8905-c5bb33cbe712/75340195935.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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 5320 bytes
SHA-256: 91ad80d985c51e7d2dbe83b03a353bdd7e92577e13b124dacce221d7e4e0abb3
font_01_sfnt_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 9508 bytes
SHA-256: cbf507d2a6bda5de297fb8c4eb7a23a904ce0a7a8fead48d17d9e61aafd2289d

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