Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66412e5fc1fb68c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 01:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2e080fbbcb8ae13ef0214fff23a69aae SHA-1: ee5c6e66ea58301923b9828561ce14540046958d SHA-256: e66412e5fc1fb68c257a962c48c06d6c1269f51bb95c4202b98b65dd74b4377e
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://bologen.ru/wix?keyword=the+dumb+waiter+monologue PDF link annotation
    • https://cdn.sqhk.co/susojareb/e3FghmR/29128264086.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/ehdhahh/95123438492.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/hfgfFjj/xugetupigizu.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/pKja6gf/33668729482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fdc26c2ab284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5fd91ccd5ca7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_6052864cd92a1.pdfIn PDF document text
    • https://cdn.sqhk.co/genazeres/hhjhbij/ufc_fight_pass.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/b1jcigG/70827298169.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/h33hiCA/tewowepogova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_5effe2a2e0e64ab1ace0c972bd92d1e8.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_c6830f3fb7ee4e9a85c45bf192960d41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/mazukemomotikoribevizo.pdfIn PDF document text
    • http://timavutiziv.epizy.com/america_the_story_of_us_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/international_baccalaureate_exam_papers_free.pdfIn PDF document text
    • http://jogisav.epizy.com/acute_myocardial_infarction_surgery_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/juicios_a_priori_y_a_posteriori.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_9c2cedd711a441aa93516a245802dec3.pdf?index=trueIn PDF document text
    • http://zodabozaloti.rf.gd/73188155587.pdfIn PDF document text
    • http://nibatozov.epizy.com/advanced_java_manual.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_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 5240 bytes
SHA-256: 537917598d9f2a1e1c57dfe1983c836560729fa9862cd6b5af257ec782af3528
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10868 bytes
SHA-256: c794a832835c667256f42faf3d14c3870c91f1b74688b03a6c92150cd40a046e

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