Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8376eb94d02d60d…

MALICIOUS

PDF

41.1 KB Created: 2020-11-04 03:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 23c15ea57118f3123863b632e1d7e9dd SHA-1: 260b3892a1d6b08afce1875e7e27b34c94eb99fd SHA-256: d8376eb94d02d60d577c54636b0a5fde3035b8c2c85c4e65480757b9bbe942f4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/123?keyword=pesticide+core+manual In PDF document text
    • https://lafozevu.weebly.com/uploads/1/3/4/3/134378288/9686890f8.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/15ba21d21caf.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f8f4dae29e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_5f9b836284743.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/vuwijipiso.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/7f893ea4-5a4e-4127-afcf-4fecfeabca5c/40937021352.pdfIn PDF document text
    • https://s3.amazonaws.com/muguroviv/miles_stanford_the_complete_green_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1329fd2-3f09-471f-bf4f-e27444929e60/vefisenozibarinun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6509ed-434a-4e27-a71b-9e3600ba1960/38083556783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0effbc4c-b932-4511-86dc-58790f3dfe94/37129892734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/768e2519-a516-4929-8b7f-b169803d0a58/1777025426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a93eba-5fd5-4bb5-9170-20f0ed07a823/34970917776.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/42720291619.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_off000063e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 5084 bytes
SHA-256: 8434b56e9a2cdf52ad97c8b21418f1223ce17e7ec1de7205a5fb98ce24b21426
font_01_sfnt_off00007510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 10284 bytes
SHA-256: de41561f0185b56f41a4398497fd7e91077712874699200d23b4294942a520f0

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