Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ae8d837a37cfa5…

MALICIOUS

PDF

47.1 KB Created: 2020-11-07 23:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a7f0923ad2505d451702905109083e9 SHA-1: 9d73e4d52abca3b40f435833352f9d4ccef396be SHA-256: 92ae8d837a37cfa5041c4c9ff1bc65ea5556f0f35402b23afb9a81b4bc1e6376
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=symbolism+in+to+kill+a+mockingbird+powerpoint PDF link annotation
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/revame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f94c7eee2567.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/3502577.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/wezepipo.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/dofofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5fa2692272a70.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/a37a873d1e47.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/1429013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5fa6b0fb34f64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gogonof/apache_tomcat_7_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfafb068-0689-4547-a8e1-7cbc7ad057d9/bukre_kitab_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/basic_life_support_manual_aha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508fb560-1b2b-414e-97be-6f2e7b522c5f/84639841745.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 5680 bytes
SHA-256: d3586561614320482a8ad73479ee3cecabb2cfa3a93f5b5a2c9d79d762566d4d
font_01_sfnt_off00007d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D69 10484 bytes
SHA-256: e82bb236266524f483b4cf47916b3ac87afbd21ac79ccef7455fd41463d448c6
font_02_sfnt_off0000a140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA140 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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