Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aee4c864a40b33…

MALICIOUS

PDF

100.1 KB Created: 2021-04-01 19:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5715324f75ec75545f315f81ded9da7 SHA-1: c6bff32c3e4d106e5cb2b032f9e90f002aa6527e SHA-256: d4aee4c864a40b3347e66d09f91e5da7597ee56815e197ae05a3888eb58081c0
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 0.9995

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://vilenefex.ru/wix?keyword=petsafe+wireless+manual PDF link annotation
    • http://gubixazolela.sportsontheweb.net/chinese_alphabet.pdfIn PDF document text
    • http://pogadai.xyz/tenegumesubovu6pm5p.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/actos_administrativos.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/81810125971j0ib.pdfIn PDF document text
    • http://workbykoder.xyz/how_to_connect_to_blueant_bluetoothz2qki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_60468a8585a4d.pdfIn PDF document text
    • https://zulitaxovali.weebly.com/uploads/1/3/5/3/135351491/73bbb.pdfIn PDF document text
    • http://sendgrid-de.com/kong_godzilla_trailervrarm.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/pipitiwikoxavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_6055b2b4843ed.pdfIn PDF document text
    • http://bigojojodun.iblogger.org/13359251162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_60298da2d7c4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465018/normal_5ff8cac8a9041.pdfIn PDF document text
    • https://jedujidiki.weebly.com/uploads/1/3/4/3/134352610/920d2a1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_682702d024524ff3a2fac967a8cd38d9.pdf?index=trueIn PDF document text
    • http://botalibinizor.rf.gd/74073298748.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_f528443857954701a75d143188192cfd.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_d68a091aa8cd45018e58b4945eeeadea.pdf?index=trueIn PDF document text
    • http://zagebixomibolo.rf.gd/all_in_one_english_class_10_2020.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_da686842e6944fc39b2c92a4cc8bba8d.pdf?index=trueIn PDF document text
    • http://puxorowa.epizy.com/19343473271.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_off000147fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FA 5004 bytes
SHA-256: 48f57a3835b333c3d72f14f18eeef9ede73ddbac723752aa64b5e9fa808279ec
font_01_sfnt_off000158fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FD 11856 bytes
SHA-256: 1e728d74a99c2c93e7f165e816f70492b99b59fb83e0ee83222ab1e057fba653

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