Malicious PDF — malware analysis report

Static analysis result for SHA-256 455d4fd4d3bd4717…

MALICIOUS

PDF

75.0 KB Created: 2021-03-31 21:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83f8d3ae947c8ce0fe6726fa5d516a22 SHA-1: 11426d073782aa771c849dad2d9e472cbc211442 SHA-256: 455d4fd4d3bd47176b88d16e4525bfd0cb9f05e220e09c6c8385ec53bffe1995
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 0.9998

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://resalured.ru/award?keyword=catalogo+jequiti+pdf+08+2020 PDF link annotation
    • https://fefirewaw.weebly.com/uploads/1/3/0/7/130775199/8d87c479ebc.pdfIn PDF document text
    • https://jorikune.weebly.com/uploads/1/3/4/3/134371696/835bb314f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_601cdb5b07cae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382004/normal_5fc5bf7c6b60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fd22a85208c4.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/tugasotudad.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/70141465956.pdfIn PDF document text
    • https://wubajepetodol.weebly.com/uploads/1/3/1/6/131606368/3458724.pdfIn PDF document text
    • https://zexexidiwe.weebly.com/uploads/1/3/5/3/135330220/2056330.pdfIn PDF document text
    • https://xejuxomezul.weebly.com/uploads/1/3/1/6/131637030/c62ccde645d427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_6021839b7cddd.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/remeranexe/29084845995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9423d2c-f378-4470-b717-687d77564a4c/bizugobakaxaj.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/stock_discrepancy_report_template.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_584965f784fe435f97043759370389af.pdf?index=trueIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_878afaa00ea14bbe867ceb99fce94721.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f233927f-6952-46d6-a86a-d2af6c7490bc/irobot_roomba_561_battery_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/geethanjali_movie_audio_naa_songs.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 5512 bytes
SHA-256: 36b2e1987bc18adb49f9334349caebeec0fe96c0c4e5f0280a859e4eb99649cc
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 13096 bytes
SHA-256: a32dc750a4666eaeadcd65e7195759be1e6192726df081e1fc17ef04db632956

Open this report in the interactive analyzer, or submit your own file for analysis.