Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dfa26bc878c564…

MALICIOUS

PDF

76.3 KB Created: 2021-05-01 08:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e9b12d369ccc5834b404c6c947c6e38d SHA-1: 218327b0dabb4795823fa2b52879a3a60b40d198 SHA-256: 15dfa26bc878c56401bd2c5b306d99e901b24ddaffabcac9dbdcd8a0f8c42c1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to disposable hosting, indicating a link farm or SEO spam campaign. The document's apparent purpose is to drive traffic to these external sites, which could be used for advertising, phishing, or distributing further malicious content. No scripts were extracted, but the presence of numerous external links suggests a malicious intent to redirect the user.

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://pelibifir.ru/strik?utm_term=finding+volume+of+two+rectangular+prisms+worksheet PDF link annotation
    • https://cdn.sqhk.co/pizililiv/ieliWRH/verumilozitavoxekenegajel.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/En9dibX/best_board_games_for_adults_strategy.pdfIn PDF document text
    • http://triple-doska5.club/magic_bubble_oz_popsicleof7pn.pdfIn PDF document text
    • http://tipografiyav.moscow/haruki_murakami_schedulet6744.pdfIn PDF document text
    • http://terugate.mypressonline.com/examveda_aptitude.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/zheeicf/old_national_bank_hsa_authority_debit_card.pdfIn PDF document text
    • http://filemarker.store/tekobevopilewoxepachffr.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/wunojixuz.pdfIn PDF document text
    • http://nudistoff.club/23195399210nnujq.pdfIn PDF document text
    • http://twobigs.space/1260292585986yw8.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://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a83efd3829064bf8a6f39e62c4407c98.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_62653e867c484619b3165b405bd9cbca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/325510a3-d8ef-4332-80f3-3187915dd472/how_to_clean_a_whirlpool_glass_stove_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996dc9d5-75d2-4894-a0ea-987c0626cc2f/13425701303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4bdb9c-be2c-4dc1-a2e4-6a880e1ae764/22977152551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c555623c-a445-455d-8e82-522705c32023/safety_first_rectal_thermometer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af75be47-b743-46ab-9cf1-15c7c9afc1a9/jipisabitumojor.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/earthquake_newspaper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/66140735922.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 5620 bytes
SHA-256: 687bebc8eaabb6dec812f051dafea5d680fe50b29e4e47a760f9b5cf7be34339
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 10864 bytes
SHA-256: 3171799a8489ec054d3778f23b1f0700243d80d725b2314e54241b2101ed62f0
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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