Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf2b0c2cf2d939…

MALICIOUS

PDF

88.3 KB Created: 2021-03-19 03:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 98f79705c6db439feb76124f854a8646 SHA-1: c67c0bbece27c7bcaaa407e6d6436f74571c6a5f SHA-256: bedf2b0c2cf2d939e90dfeab1abb7efe00fd77cf53893789b9fddbad5b7b4ab3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous external URLs pointing to various domains, some of which are disposable hosting services. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=indiana+for+hire+endorsement+test+answers PDF link annotation
    • https://nimekeboxiz.weebly.com/uploads/1/3/0/8/130873861/pimefasan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_604d3f74a2df6.pdfIn PDF document text
    • http://hugertely.xyz/sevumimomowogikezaa8h1k.pdfIn PDF document text
    • http://intekzafast.online/65521289361toxcg.pdfIn PDF document text
    • http://dalkomis.website/holt_mcdougal_geometry_textbook_answerstg5t3.pdfIn PDF document text
    • http://study-english-02.space/tutesovejomorawidinakedml8af.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/fk3ibgh/poxabevigijerana.pdfIn PDF document text
    • https://jisofuzevilane.weebly.com/uploads/1/3/0/9/130969501/a75395dfd36ec0f.pdfIn PDF document text
    • http://ideal-it.fun/absolute_java_6e_15z6jtq.pdfIn PDF document text
    • http://marketitaly.pro/zufajegamimumobolavarexvu778.pdfIn PDF document text
    • http://obschee.xyz/619996203382br6.pdfIn PDF document text
    • http://braco.ru/best_c_books_reddit_20206r1u1.pdfIn PDF document text
    • http://detonic-official.website/mobile_kitchen_rental_torontodl1bz.pdfIn PDF document text
    • https://jototafedapabo.weebly.com/uploads/1/3/1/3/131398279/a627edc1.pdfIn PDF document text
    • http://kittyplay.online/83487831155l9iii.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/hd7mjan/98880798113.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/JFgfhaD/53710166078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_5fd8e80375a30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_1120f36bf0e64eca880beaf9edd39977.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_81cb3d49076f4a7b8f0f9847a4bccc19.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_62cbb93abf4a44e998f81c43ed4f2662.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_cb99cf7cea044b43930d8852c55598b1.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_11e423c75c73406fadc69a0d48d4a2b2.pdf?index=trueIn 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_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 5144 bytes
SHA-256: 38f7de1486746307c2001ef001c05d0cf5df0f24dcffebc6e9d4db65a850e37f
font_01_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10576 bytes
SHA-256: fe18a9e78b6dce9397e54bf1d10480041fb156a9cb463820a7ad58b9af1f669e

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