Malicious PDF — malware analysis report

Static analysis result for SHA-256 a700bcd6569ee3c4…

MALICIOUS

PDF

100.3 KB Created: 2021-03-20 18:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cbb463debc8fb10a8adf434e295b69b5 SHA-1: 2103723e357e961f82b9bd11d879c2723e1f0725 SHA-256: a700bcd6569ee3c423e298fb8e4bb1895d2bbf99de3dd178d04da7deb7cf9b6c
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. It contains a large number of external links, many hosted on disposable domains or domains designed for SEO, indicating a link farm or redirection scheme. The primary URL, 'https://seumenha.ru/wix?keyword=swtor+lethality+operative', suggests a potential lure or keyword stuffing tactic. While no scripts were extracted, the structure and numerous external links point towards a malicious intent, possibly to distribute further malware or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://seumenha.ru/wix?keyword=swtor+lethality+operative PDF link annotation
    • https://cdn.sqhk.co/sewiboveso/bZhijfg/34812454430.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/Ldiawji/crunchyroll_subscription_cost_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/id3gHWz/pazubolipiwob.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://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_17c71dfa6e584e06b775ed46086778b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c0c6b0-2473-4bd6-9850-929e1acd4cda/temuvit.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_d19b10ac152c41e3bcc72bbc91b2f61e.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_1df7d69c296940ea88669b55b0b3ee98.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_731c24e9033843fe9c13699cde483261.pdf?index=trueIn PDF document text
    • http://wafuzujutine.rf.gd/pitasubulapelafagebisik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630c03ce-f4b0-41c4-8ec7-8f65659b2aaf/xakisok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c3c624-2236-488b-a0a0-5913e6f70b8e/12484429898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cea537a-8cfb-49c1-9e4b-da44b56558af/medical_surgical_nursing_2_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf9fa0d-01db-40f6-85ee-6132a0585560/34672634066.pdfIn PDF document text
    • http://werapitagu.rf.gd/poroj.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_8e9052512f5c4f969193b21efa880b3b.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_cd05cadf3cae439db2ba5b5fad7606dc.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_ef97ec1cd18148d6aec197dc731669d9.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_73596b4593b94bd48e79393e394b0b18.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_0e3077ea851b4bb7a111b4423a0943be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b8081a-fe17-41df-9165-3e517bae206a/66315091622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a8d534-c51e-46ff-9473-93d8e8f3ae1b/fight_club_book_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559bf04e-b54a-410f-96b9-62767490c348/bridge_cheat_sheet.pdfIn PDF document text
    • http://bujisovi.epizy.com/fenavelilatujavav.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_a98b3315c3d54a4b9dfe8ce5f2b32f57.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAC 4768 bytes
SHA-256: 17ebdf449684ae74ea0d2c12127ff06d280b10c3171221a0ac919f87ec7eabfb
font_01_sfnt_off00014f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F03 10944 bytes
SHA-256: 26246f945332a2c2c70ad03b5cab9f9ba22087df15be93ed9e8bda8ff5812090
font_02_sfnt_off00017403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17403 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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