Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac1064f140e18be…

MALICIOUS

PDF

80.0 KB Created: 2021-06-03 00:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 41ebe144c75ca07ad657ebd616034c8e SHA-1: 5a66fbe59d75546fff111d0974a495a278bc5eb5 SHA-256: eac1064f140e18beae2feedc495d740779804338e7f1a15ac845119016602787
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=what+education+do+you+need+to+be+a+millwright PDF link annotation
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/mumipon.pdfIn PDF document text
    • https://wazexusevawixi.weebly.com/uploads/1/3/0/7/130776334/zakug.pdfIn PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/5cfee2.pdfIn PDF document text
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/9566216.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/didus.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/suxugoresajusosimomo.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/nuritogu-lodeli-wumoruvukalo-nutozaw.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/werevopujuzubenida.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/345ce45047b5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0f4d64-9bc2-4194-a076-7cd49dadb184/fitokufimubejorukomogot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4880c784-7ffe-433b-a9d0-2b39f2f4936e/taming_of_the_shrew_act_1_scene_1_quotes.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/why_do_we_say_soccer_instead_of_football.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/beginners_guide_to_constructing_the_universe_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9ec2a3-bc89-4985-815b-f084ad36dbbd/cool_guitar_songs_easy_chords.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144493740/27755286307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65747f7-979f-44c5-ae22-87242551b221/disney_plus_price_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85da98e1-bf29-4bc5-878f-f13ae68851b2/2010_lexus_rx_350_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bddc2bd-208a-44c7-8b32-8f59cd7fd4f9/ar_15_pistol_single_point_sling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dda2473-f604-4a6d-8798-0e74c59ccfee/99459241075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15d7e0f-f9e5-4574-9178-6acc43faf7ea/bevanibivuzevof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7b4505-9694-4f45-befd-9ddf3658edab/how_to_connect_to_flexsmart_x3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020f10cb-144d-4f31-8bdc-ba6be583496e/11990263720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1493a243-8af0-4507-b8d0-e240d281426c/thomas_troward_wikipedia.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_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 5520 bytes
SHA-256: 274a28941a6fc834758d96b1ebfc8ac15a38fce6faf760db91798a7fd68b3ff4
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 10628 bytes
SHA-256: ddae2ac4b09329f3e2c42c582951f0c2c081dfc9b47e0a6d5717c9679bca0bf5

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